dt-bindings: timer: renesas,tmu: Add R-Car V4M support

Document support for the Timer Unit (TMU) in the Renesas R-Car V4M
(R8A779H0) SoC.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/8a39386b1a33db6e83e852b3b365bc1adeb25242.1712068574.git.geert+renesas@glider.beSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/timer/renesas,tmu.yaml

@@ -39,6 +39,7 @@ properties:
           - renesas,tmu-r8a779a0 # R-Car V3U
           - renesas,tmu-r8a779f0 # R-Car S4-8
           - renesas,tmu-r8a779g0 # R-Car V4H
+          - renesas,tmu-r8a779h0 # R-Car V4M
       - const: renesas,tmu
 
   reg: