gpio: rcar: Convert to DEFINE_SIMPLE_DEV_PM_OPS()

Convert the Renesas R-Car GPIO driver from SIMPLE_DEV_PM_OPS() to
DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr().  This lets us drop the
check for CONFIG_PM_SLEEP, and reduces kernel size in case CONFIG_PM or
CONFIG_PM_SLEEP is disabled, while increasing build coverage.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/e201140426daacaa799d73e2f76bfd96b6f5718f.1752086619.git.geert+renesas@glider.be


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>