drivers: gpio: rcar: drop DEV_DATA/DEV_CFG usage
drivers: gpio: rcar: drop DEV_DATA/DEV_CFG usage

Stop using redundant DEV_DATA/DEV_CFG macros and use dev->data and
dev->config instead.
Follows #41918.

Signed-off-by: Aymeric Aillet <50ecb97e8539231bfe69207a233bb1580c5def34@iot.bzh>

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