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

Add pins, groups and functions for the High Speed Serial Communication
Interfaces with FIFO (HSCIF) 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/27577af0042928e4b673a2774c68a14c4ea7c157.1706264667.git.geert+renesas@glider.be