dt-bindings: timer: renesas: tmu: Document r8a774c0 bindings

Document RZ/G2E (R8A774C0) SoC in the Renesas TMU bindings.
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,tmu.txt

@@ -10,6 +10,7 @@ Required Properties:
 
   - compatible: must contain one or more of the following:
     - "renesas,tmu-r8a7740" for the r8a7740 TMU
+    - "renesas,tmu-r8a774c0" for the r8a774C0 TMU
     - "renesas,tmu-r8a7778" for the r8a7778 TMU
     - "renesas,tmu-r8a7779" for the r8a7779 TMU
     - "renesas,tmu-r8a77970" for the r8a77970 TMU