dt-bindings: can: rcar_canfd: document r8a774a1 support

Document the support for rcar_canfd on R8A774A1 SoC devices.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/net/can/rcar_canfd.txt

@@ -4,6 +4,7 @@ Renesas R-Car CAN FD controller Device Tree Bindings
 Required properties:
 - compatible: Must contain one or more of the following:
   - "renesas,rcar-gen3-canfd" for R-Car Gen3 and RZ/G2 compatible controllers.
+  - "renesas,r8a774a1-canfd" for R8A774A1 (RZ/G2M) compatible controller.
   - "renesas,r8a774c0-canfd" for R8A774C0 (RZ/G2E) compatible controller.
   - "renesas,r8a7795-canfd" for R8A7795 (R-Car H3) compatible controller.
   - "renesas,r8a7796-canfd" for R8A7796 (R-Car M3-W) compatible controller.
@@ -32,10 +33,10 @@ enable/disable the respective channel.
 Required properties for "renesas,r8a774c0-canfd", "renesas,r8a7795-canfd",
 "renesas,r8a7796-canfd", "renesas,r8a77965-canfd", and "renesas,r8a77990-canfd"
 compatible:
-In R8A774C0, R8A7795, R8A7796, R8A77965, and R8A77990 SoCs, canfd clock is a
-div6 clock and can be used by both CAN and CAN FD controller at the same time.
-It needs to be scaled to maximum frequency if any of these controllers use it.
-This is done using the below properties:
+In R8A774A1, R8A774C0, R8A7795, R8A7796, R8A77965, and R8A77990 SoCs, canfd
+clock is a div6 clock and can be used by both CAN and CAN FD controller at the
+same time. It needs to be scaled to maximum frequency if any of these
+controllers use it. This is done using the below properties:
 
 - assigned-clocks: phandle of canfd clock.
 - assigned-clock-rates: maximum frequency of this clock.