dt-bindings: PCI: rcar: Add device tree support for r8a774b1

Add PCIe support for the RZ/G2N (a.k.a. R8A774B1).

Signed-off-by: Fabrizio Castro <[e-mail]>
Reviewed-by: Andrew Murray <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

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

···
 compatible: "renesas,pcie-r8a7743" for the R8A7743 SoC;
 	    "renesas,pcie-r8a7744" for the R8A7744 SoC;
 	    "renesas,pcie-r8a774a1" for the R8A774A1 SoC;
+	    "renesas,pcie-r8a774b1" for the R8A774B1 SoC;
 	    "renesas,pcie-r8a774c0" for the R8A774C0 SoC;
 	    "renesas,pcie-r8a7779" for the R8A7779 SoC;
 	    "renesas,pcie-r8a7790" for the R8A7790 SoC;