arm64: dts: renesas: r8a779h0: Add pinctrl device node

Add a device node for the Pin Function Controller on the Renesas R-Car
V4M (R8A779H0) SoC.
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/0ab32290014b64ddbee5c9ec2808c8294d0b6192.1706266286.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a779h0.dtsi

@@ -70,6 +70,14 @@ rwdt: watchdog@e6020000 {
 			status = "disabled";
 		};
 
+		pfc: pinctrl@e6050000 {
+			compatible = "renesas,pfc-r8a779h0";
+			reg = <0 0xe6050000 0 0x16c>, <0 0xe6050800 0 0x16c>,
+			      <0 0xe6058000 0 0x16c>, <0 0xe6058800 0 0x16c>,
+			      <0 0xe6060000 0 0x16c>, <0 0xe6060800 0 0x16c>,
+			      <0 0xe6061000 0 0x16c>, <0 0xe6061800 0 0x16c>;
+		};
+
 		cpg: clock-controller@e6150000 {
 			compatible = "renesas,r8a779h0-cpg-mssr";
 			reg = <0 0xe6150000 0 0x4000>;