drivers: espi: xec: mec172x: Fix compilation when OOB RX async is enabled
drivers: espi: xec: mec172x: Fix compilation when OOB RX async is enabled

Correct MEC172x OOB register access that causes compilation error,
Use device-tree-based register access instead of HAL access
This occurs whenever CONFIG_ESPI_OOB_CHANNEL_RX_ASYNC is
enabled.

Signed-off-by: Jose Alberto Meza <93346bcba00086196ffe58e37d7adff1143c3f07@intel.com>

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