dt-bindings: pci: rcar: add r8a77961 support

Add support for r8a77961 (R-Car M3-W+).

To avoid confusion between R-Car M3-W (R8A77960) and R-Car M3-W+
(R8A77961), this patch also updates the comment of
"renesas,pcie-r8a7796".

Link: https://lore.kernel.org/r/1586511020-31833-1-git-send-email-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pci/rcar-pci.txt

@@ -11,7 +11,8 @@ compatible: "renesas,pcie-r8a7743" for the R8A7743 SoC;
 	    "renesas,pcie-r8a7791" for the R8A7791 SoC;
 	    "renesas,pcie-r8a7793" for the R8A7793 SoC;
 	    "renesas,pcie-r8a7795" for the R8A7795 SoC;
-	    "renesas,pcie-r8a7796" for the R8A7796 SoC;
+	    "renesas,pcie-r8a7796" for the R8A77960 SoC;
+	    "renesas,pcie-r8a77961" for the R8A77961 SoC;
 	    "renesas,pcie-r8a77980" for the R8A77980 SoC;
 	    "renesas,pcie-r8a77990" for the R8A77990 SoC;
 	    "renesas,pcie-rcar-gen2" for a generic R-Car Gen2 or