dt-bindings: timer: renesas,tmu: Document missing Gen3 SoCs

Add missing bindings for Gen3 SoCs.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210211143102.350719-1-niklas.soderlund+renesas@ragnatech.se

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

@@ -28,8 +28,14 @@ properties:
           - renesas,tmu-r8a774e1 # RZ/G2H
           - renesas,tmu-r8a7778  # R-Car M1A
           - renesas,tmu-r8a7779  # R-Car H1
+          - renesas,tmu-r8a7795  # R-Car H3
+          - renesas,tmu-r8a7796  # R-Car M3-W
+          - renesas,tmu-r8a77961 # R-Car M3-W+
+          - renesas,tmu-r8a77965 # R-Car M3-N
           - renesas,tmu-r8a77970 # R-Car V3M
           - renesas,tmu-r8a77980 # R-Car V3H
+          - renesas,tmu-r8a77990 # R-Car E3
+          - renesas,tmu-r8a77995 # R-Car D3
       - const: renesas,tmu
 
   reg: