dt-bindings: timer: renesas, cmt: Document r8a774a1 CMT support

Document SoC specific bindings for RZ/G2M (r8a774a1) SoC.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
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

@@ -30,6 +30,8 @@ Required Properties:
     - "renesas,r8a7745-cmt1" for the 48-bit CMT1 device included in r8a7745.
     - "renesas,r8a77470-cmt0" for the 32-bit CMT0 device included in r8a77470.
     - "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,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.
@@ -51,9 +53,12 @@ Required Properties:
 		and RZ/G1.
 		These are fallbacks for r8a73a4, R-Car Gen2 and RZ/G1 entries
 		listed above.
-    - "renesas,rcar-gen3-cmt0" for 32-bit CMT0 devices included in R-Car Gen3.
-    - "renesas,rcar-gen3-cmt1" for 48-bit CMT1 devices included in R-Car Gen3.
-		These are fallbacks for R-Car Gen3 entries listed above.
+    - "renesas,rcar-gen3-cmt0" for 32-bit CMT0 devices included in R-Car Gen3
+		and RZ/G2.
+    - "renesas,rcar-gen3-cmt1" for 48-bit CMT1 devices included in R-Car Gen3
+		and RZ/G2.
+		These are fallbacks for R-Car Gen3 and RZ/G2 entries listed
+		above.
 
   - reg: base address and length of the registers block for the timer module.
   - interrupts: interrupt-specifier for the timer, one per channel.