dt-bindings: rpc: renesas-rpc-if: Add support for the R8A779A0 RPC-IF

Add bindings for the R8A779A0 (R-Car V3U).
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210922085831.5375-1-wsa+renesas@sang-engineering.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

Documentation/devicetree/bindings/memory-controllers/renesas,rpc-if.yaml

@@ -33,6 +33,7 @@ properties:
           - renesas,r8a77970-rpc-if       # R-Car V3M
           - renesas,r8a77980-rpc-if       # R-Car V3H
           - renesas,r8a77995-rpc-if       # R-Car D3
+          - renesas,r8a779a0-rpc-if       # R-Car V3U
       - const: renesas,rcar-gen3-rpc-if   # a generic R-Car gen3 or RZ/G2 device
 
   reg: