pinctrl: renesas: r8a779g0: Add missing PWM

R-Car V4H has PWM/PWM_A/PWM_B, but current PFC setting is mixed.
This patch adds missing PWM settings, and tidies these up.

According to Document, GP3_14 Function4 is PWM2_A,
but we can't select it at P1SR3[27:24].
This patch just ignore it for now.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87o7y9sj90.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>