pinctrl: renesas: fix R-Car gpio0_00 operation fails with 'gpio -input' command

Fix GPIO bank 0 pin 0 request/release off by one error. Without this
patch, it is not possible to request/release GPIO bank 0 pin 0.

Signed-off-by: Tiezhuang Dong <tiezhuang.dong.yh@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Eugeniu Rosca <roscaeugeniu@gmail.com>
Cc: Yoshihiro Shimoda <shimoda.yoshihiro.uh@renesas.com>