drivers: bbram: mec: fixed compilation error
drivers: bbram: mec: fixed compilation error

Fixed compilation error when building bbram driver
for MEC15xx

Signed-off-by: Jay Vasanth <f29a0b91d696aa12caa0e00daf52bda6a5259c6c@microchip.com>

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