pinctrl: renesas: r8a779a0: Add PWM pins, groups and functions

This patch adds PWM0-4 pins, groups and functions to the R8A779A0 (V3U)
SoC.

Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20210112165929.31002-10-uli+renesas@fpond.eu


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