pinctrl: renesas: r8a779a0: Add INTC-EX pins, groups and function

Add pins, groups, and function for the Interrupt Controller for External
Devices (INTC-EX) on the R-Car R8A779A0 (V3U) SoC.

Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20210112165929.31002-7-uli+renesas@fpond.eu


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