dt-bindings: PCI: rcar-gen4-pci-ep: Add R-Car V4M compatible

Document bindings for R-Car V4M (R8A779H0) PCIe endpoint module.

Link: https://lore.kernel.org/linux-pci/20240822064459.1133748-3-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: shimoday

Documentation/devicetree/bindings/pci/rcar-gen4-pci-ep.yaml

@@ -19,6 +19,7 @@ properties:
       - enum:
           - renesas,r8a779f0-pcie-ep      # R-Car S4-8
           - renesas,r8a779g0-pcie-ep      # R-Car V4H
+          - renesas,r8a779h0-pcie-ep      # R-Car V4M
       - const: renesas,rcar-gen4-pcie-ep  # R-Car Gen4
 
   reg: