dt-bindings: timer: renesas, cmt: Document r8a774c0 CMT support

Document SoC specific bindings for RZ/G2E (r8a774c0) SoC.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

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

@@ -32,6 +32,8 @@ Required Properties:
     - "renesas,r8a77470-cmt1" for the 48-bit CMT1 device included in r8a77470.
     - "renesas,r8a774a1-cmt0" for the 32-bit CMT0 device included in r8a774a1.
     - "renesas,r8a774a1-cmt1" for the 48-bit CMT1 device included in r8a774a1.
+    - "renesas,r8a774c0-cmt0" for the 32-bit CMT0 device included in r8a774c0.
+    - "renesas,r8a774c0-cmt1" for the 48-bit CMT1 device included in r8a774c0.
     - "renesas,r8a7790-cmt0" for the 32-bit CMT0 device included in r8a7790.
     - "renesas,r8a7790-cmt1" for the 48-bit CMT1 device included in r8a7790.
     - "renesas,r8a7791-cmt0" for the 32-bit CMT0 device included in r8a7791.