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

Add pins, groups and functions for Audio 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/e7d5024c23929d2eccb02bb5daf44c914db07d80.1706264667.git.geert+renesas@glider.be