drivers: gpio_s32: expose gpio_utils.h
drivers: gpio_s32: expose gpio_utils.h

Expose gpio_utils.h to follow updates in #51526

Signed-off-by: Dat Nguyen Duy <bf7fb944b273616b0fab8ab74d059f7859c8a668@nxp.com>

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