board: intel_adsp_ace15_mtpm xtensa toolchain upgrade and enable xt-clang

[aborisovich]

Release toolchain for Intel Meteorlake board is Xtensa RI-2022.10.
Upgraded toolchain to final version. New Xtensa toolchains does not support obsolete xt-xcc driver anymore,
so we need to switch to new xt-clang driver.
In this PR:

• modified xtensa-build-system.py to build mtl platform with new Xtensa toolchain version RI-2022.10 and core ace10_LX7HiFi4_2022_10
• modified processes and xtensa-build-system.py to use new compiler xt-clang as the xt-xcc is not available anymore
  in new Xtensa toolchains.
• added requirement to SOF project to use C++17 standard. This was caused by changes in Zephyr lib: os: PoT utilities, hash function, hash map (hash table) zephyrproject-rtos/zephyr#53405 that require C++14 standard.
  MTL has cpp code that uses those headers but we can move straight away to C++17 as the newest standard supported by xt-clang in this toolchain.
• please note: commit 9ae133d1abedd0ab8ebc8999954cf249648e84e7 will be dropped from this PR before merging. It contains temporary code to test new toolchain in Intel Internal CI & SOF CI and also provide debug logging.

Merging this PR will require synchronization with the Intel Internal CI team so they can change environmental variables on their side that would select new toolchain as default in production.

Dependencies:

• boards: intel_adsp_ace15_mtpm board uses Xtensa toolchain xt-clang driver for twister zephyrproject-rtos/zephyr#54333 NOT MANDATORY
• toolchain: rename xcc-clang to xt-clang, and add linker profile xt-ld zephyrproject-rtos/zephyr#54836
• Fixed warnings issued by new xt-clang compiler #7096
• Changes in the Intel internal CI.
• full scope tests for MTL to prove lack of regression