dt-bindings: pwm: renesas-tpu: Document more R-Car Gen2 support

All R-Car Gen2 SoCs have a Renesas Timer Pulse Unit.
Document support for the missing variants.

No driver change is needed due to the fallback compatible string.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.yaml

@@ -19,6 +19,10 @@ properties:
           - renesas,tpu-r8a7744   # RZ/G1N
           - renesas,tpu-r8a7745   # RZ/G1E
           - renesas,tpu-r8a7790   # R-Car H2
+          - renesas,tpu-r8a7791   # R-Car M2-W
+          - renesas,tpu-r8a7792   # R-Car V2H
+          - renesas,tpu-r8a7793   # R-Car M2-N
+          - renesas,tpu-r8a7794   # R-Car E2
           - renesas,tpu-r8a7795   # R-Car H3
           - renesas,tpu-r8a7796   # R-Car M3-W
           - renesas,tpu-r8a77965  # R-Car M3-N