pinctrl: renesas: r8a779h0: Add SCIF pins, groups, functions

Add pins, groups and functions for the Serial Communication Interfaces
with FIFO (SCIF) on the Renesas R-Car V4M (R8A779H0) SoC.

Signed-off-by: Cong Dang <cong.dang.xn@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/4ad8127a54fb36044ae85db07ff30be05fa5d0f0.1706264667.git.geert+renesas@glider.be