drivers: gpio: Update gpio driver for Renesas RA series

Background of this modification is to make gpio driver code
provided by Renesas vendor to be an official support for Renesas
MCU on Zephyr

Signed-off-by: Quy Tran <quy.tran.pz@renesas.com>
Signed-off-by: Duy Phuong Hoang. Nguyen <duy.nguyen.xa@renesas.com>