arm64: dts: renesas: r8a779a0: Add PWM nodes

This patch adds PWM nodes for R-Car V3U (r8a779a0) SoC.

Signed-off-by: Phong Hoang <phong.hoang.wz@renesas.com>
[wsa: rebased]
Tested-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20230502170618.55967-3-wsa+renesas@sang-engineering.com


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