app: boards: intel_adsp_ace15_mtpm: disable IMR context-save

Keep context save still disabled for Intel Meteor Lake. This
setting has been used in SOF2.8 and SOF2.9 releases and is used
in Chromebook SOF builds for these platforms. Make the SOF main
default match the releases.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

app/boards/intel_adsp_ace15_mtpm.conf

@@ -20,7 +20,7 @@ CONFIG_PM_POLICY_CUSTOM=y
 CONFIG_POWER_DOMAIN=y
 CONFIG_POWER_DOMAIN_INTEL_ADSP=y
 
-CONFIG_ADSP_IMR_CONTEXT_SAVE=y
+CONFIG_ADSP_IMR_CONTEXT_SAVE=n
 CONFIG_ADSP_IDLE_CLOCK_GATING=y
 
 # enable Zephyr drivers