arm64: dts: renesas: r8a779a0: Add pinctrl device node

This patch adds the pinctrl device node for the R8A779A0 (V3U) SoC.

Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20210112165948.31162-1-uli+renesas@fpond.eu


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