pinctrl: renesas: r8a779h0: Add PWM/TPU pins, groups, functions

Add pins, groups and functions for the PWM and 16-Bit Timer Pulse Units
(TPU) 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/ddbd37b1815169a8b18c5026bc4fd957f0b25dde.1706264667.git.geert+renesas@glider.be