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

This patch adds MMC pins, groups and functions to R8A779A0 (V3U) SoC.

Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20210112165929.31002-8-uli+renesas@fpond.eu


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