intel: adsp: add restore vector after pg
intel: adsp: add restore vector after pg

This patch adds core restore vector. FW will restore core context from
memory and then return to the state it was in before power gaiting.

Adding struct of LPSRAM header. ROM during reboot check this struct in
serching for magic value and restore vector address.

Signed-off-by: Tomasz Leman <b95f6f4cb1ad956ce2cfa29368a30256aa48db3f@intel.com>

galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr