dt-bindings: mmc: renesas,sdhi: R-Car V3U is R-Car Gen4

Despite the name, R-Car V3U is the first member of the R-Car Gen4
family.  Hence move its compatible value to the R-Car Gen4 section.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220608094831.8242-1-wsa+renesas@sang-engineering.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml

@@ -56,13 +56,13 @@ properties:
               - renesas,sdhi-r8a77980  # R-Car V3H
               - renesas,sdhi-r8a77990  # R-Car E3
               - renesas,sdhi-r8a77995  # R-Car D3
-              - renesas,sdhi-r8a779a0  # R-Car V3U
               - renesas,sdhi-r9a07g043 # RZ/G2UL
               - renesas,sdhi-r9a07g044 # RZ/G2{L,LC}
               - renesas,sdhi-r9a07g054 # RZ/V2L
           - const: renesas,rcar-gen3-sdhi # R-Car Gen3 or RZ/G2
       - items:
           - enum:
+              - renesas,sdhi-r8a779a0  # R-Car V3U
               - renesas,sdhi-r8a779f0  # R-Car S4-8
           - const: renesas,rcar-gen4-sdhi # R-Car Gen4