dt-bindings: memory: renesas,rpc-if: Document R-Car V4M support

Document support for the SPI Multi I/O Bus Controller (RPC-IF) in the
Renesas R-Car V4M (R8A779H0) SoC.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/263d6626fd4fa51b175b5c7a53e6a363e2c91519.1708354280.git.geert+renesas@glider.beSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

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

@@ -45,6 +45,7 @@ properties:
       - items:
           - enum:
               - renesas,r8a779g0-rpc-if       # R-Car V4H
+              - renesas,r8a779h0-rpc-if       # R-Car V4M
           - const: renesas,rcar-gen4-rpc-if   # a generic R-Car gen4 device
 
       - items: