dt-bindings: timer: renesas, cmt: Document r8a7796 CMT support

Document SoC specific bindings for R-Car M3-W (r8a7796) SoC.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/timer/renesas,cmt.txt

@@ -36,6 +36,8 @@ Required Properties:
     - "renesas,r8a7793-cmt1" for the 48-bit CMT1 device included in r8a7793.
     - "renesas,r8a7794-cmt0" for the 32-bit CMT0 device included in r8a7794.
     - "renesas,r8a7794-cmt1" for the 48-bit CMT1 device included in r8a7794.
+    - "renesas,r8a7796-cmt0" for the 32-bit CMT0 device included in r8a7796.
+    - "renesas,r8a7796-cmt1" for the 48-bit CMT1 device included in r8a7796.
     - "renesas,r8a77970-cmt0" for the 32-bit CMT0 device included in r8a77970.
     - "renesas,r8a77970-cmt1" for the 48-bit CMT1 device included in r8a77970.
     - "renesas,r8a77980-cmt0" for the 32-bit CMT0 device included in r8a77980.