dt-bindings: pwm: renesas,tpu: Add r8a779h0 support

Document support for the 16-Bit Timer Pulse Unit (TPU) in the Renesas
R-Car V4M (R8A779H0) SoC.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240725193803.14130-6-wsa+renesas@sang-engineering.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>