Fix AF_UNSPEC usage in IEEE 802.15.4 drivers

[Copilot]

Two IEEE 802.15.4 drivers used the undefined AF_UNSPEC constant instead of Zephyr's NET_AF_UNSPEC, causing build failures.

Changes

• drivers/ieee802154/ieee802154_kw41z.c: Replace AF_UNSPEC → NET_AF_UNSPEC in handle_ack()
• drivers/ieee802154/ieee802154_esp32.c: Replace AF_UNSPEC → NET_AF_UNSPEC in handle_ack()

Both files already use NET_AF_UNSPEC correctly elsewhere; these were isolated inconsistencies.

// Before
ack_pkt = net_pkt_rx_alloc_with_buffer(iface, len, AF_UNSPEC, 0, K_NO_WAIT);

// After  
ack_pkt = net_pkt_rx_alloc_with_buffer(iface, len, NET_AF_UNSPEC, 0, K_NO_WAIT);

Original prompt

FAILED: zephyr/drivers/ieee802154/CMakeFiles/drivers__ieee802154.dir/ieee802154_kw41z.c.obj
ccache /opt/toolchains/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc -DCPU_MKW41Z512VHT4 -DKERNEL -DK_HEAP_MEM_POOL_SIZE=0 -DPICOLIBC_LONG_LONG_PRINTF_SCANF -DTC_RUNID=96514c9c369b56e553db20fd6e0253b1 -DZVFS_OPEN_SIZE=6 -D_POSIX_THREAD_SAFE_FUNCTIONS=200809L -D__LINUX_ERRNO_EXTENSIONS__ -D__PROGRAM_START -D__ZEPHYR_SUPERVISOR__ -D__ZEPHYR__=1 -I/__w/zephyr/zephyr/twister-out/frdm_kw41z_mkw41z4/zephyr/tests/net/lib/mqtt_sn_packet/net.mqtt_sn.packet/zephyr/include/generated/zephyr -I/__w/zephyr/zephyr/include -I/__w/zephyr/zephyr/twister-out/frdm_kw41z_mkw41z4/zephyr/tests/net/lib/mqtt_sn_packet/net.mqtt_sn.packet/zephyr/include/generated -I/__w/zephyr/zephyr/soc/nxp/kinetis -I/__w/zephyr/zephyr/lib/libc/picolibc/include -I/__w/zephyr/zephyr/lib/posix/c_lib_ext/getopt -I/__w/zephyr/zephyr/lib/midi2/. -I/__w/zephyr/zephyr/soc/nxp/kinetis/kwx/. -I/__w/zephyr/zephyr/soc/nxp/kinetis/common -I/__w/zephyr/zephyr/soc/nxp/kinetis/../common -I/__w/zephyr/zephyr/subsys/testsuite/include -I/__w/zephyr/zephyr/subsys/testsuite/coverage -I/__w/zephyr/zephyr/subsys/testsuite/ztest/include -I/__w/zephyr/modules/hal/cmsis_6/CMSIS/Core/Include -I/__w/zephyr/zephyr/modules/cmsis_6/. -I/__w/zephyr/modules/hal/microchip/include -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk/devices/MKW41Z4 -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk/devices/MKW41Z4/drivers -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk-ng/drivers/common -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk/devices/MKW41Z4/. -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk-ng/drivers/lpuart -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk-ng/drivers/port -I/__w/zephyr/modules/hal/nxp/mcux/mcux-sdk-ng/drivers/trng -I/__w/zephyr/modules/hal/nxp/mcux/middleware/wireless/framework_5.3.3/Common -I/__w/zephyr/modules/hal/nxp/mcux/middleware/wireless/framework_5.3.3/OSAbstraction/Interface -I/__w/zephyr/modules/hal/nxp/mcux/middleware/wireless/framework_5.3.3/XCVR/MKW41Z4 -I/__w/zephyr/modules/hal/st/sensor/inc -I/__w/zephyr/modules/hal/ti/mspm0/source/ti/devices/msp/. -I/__w/zephyr/modules/hal/ti/mspm0/source/ti/devices/msp/m0p -I/__w/zephyr/modules/hal/ti/mspm0/source/ti/devices/msp/peripherals -I/__w/zephyr/modules/hal/ti/mspm0/source/ti/devices/msp/peripherals/m0p -I/__w/zephyr/modules/hal/ti/mspm0/source/ti/devices/msp/peripherals/m0p/sysctl -isystem /__w/zephyr/zephyr/lib/libc/common/include -Wshadow -fno-strict-aliasing -Werror -Os -imacros /__w/zephyr/zephyr/twister-out/frdm_kw41z_mkw41z4/zephyr/tests/net/lib/mqtt_sn_packet/net.mqtt_sn.packet/zephyr/include/generated/zephyr/autoconf.h -fno-printf-return-value -fno-common -g -gdwarf-4 -fdiagnostics-color=always -mcpu=cortex-m0plus -mthumb -mabi=aapcs -mfp16-format=ieee -mtp=soft --sysroot=/opt/toolchains/zephyr-sdk-0.17.4/arm-zephyr-eabi/arm-zephyr-eabi -imacros /__w/zephyr/zephyr/include/zephyr/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wdouble-promotion -Wno-pointer-sign -Wpointer-arith -Wexpansion-to-defined -Wno-unused-but-set-variable -Werror=implicit-int -fno-pic -fno-pie -fno-asynchronous-unwind-tables -ftls-model=local-exec -fno-reorder-functions --param=min-pagesize=0 -fno-defer-pop -fmacro-prefix-map=/__w/zephyr/zephyr/tests/net/lib/mqtt_sn_packet=CMAKE_SOURCE_DIR -fmacro-prefix-map=/__w/zephyr/zephyr=ZEPHYR_BASE -fmacro-prefix-map=/__w/zephyr=WEST_TOPDIR -ffunction-sections -fdata-sections -specs=picolibc.specs -std=c17 -MD -MT zephyr/drivers/ieee802154/CMakeFiles/drivers__ieee802154.dir/ieee802154_kw41z.c.obj -MF zephyr/drivers/ieee802154/CMakeFiles/drivers__ieee802154.dir/ieee802154_kw41z.c.obj.d -o zephyr/drivers/ieee802154/CMakeFiles/drivers__ieee802154.dir/ieee802154_kw41z.c.obj -c /__w/zephyr/zephyr/drivers/ieee802154/ieee802154_kw41z.c
/__w/zephyr/zephyr/drivers/ieee802154/ieee802154_kw41z.c: In function 'handle_ack':
/__w/zephyr/zephyr/drivers/ieee802154/ieee802154_kw41z.c:584:48: error: 'AF_UNSPEC' undeclared (first use in this function); did you mean 'NET_AF_UNSPEC'?
584 | AF_UNSPEC, 0, K_NO_WAIT);
| ^~~~~~~~~
| NET_AF_UNSPEC
/__w/zephyr/zephyr/drivers/ieee802154/ieee802154_kw41z.c:584:48: note: each undeclared identifier is reported only once for each function it appears in
ninja: build stopped: subcommand failed.

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