pinctrl: renesas: rzg2l: Simplify rzg2l_gpio_irq_{en,dis}able()

Simplify rzg2l_gpio_irq_{en,dis}able() by adding a helper function
rzg2l_gpio_irq_endisable().

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240206135115.151218-3-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>