arm64: renesas: r8a7795: enable PFC

Add a PFC node for the on-chip r8a7795 pin controller.
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NMagnus Damm <damm+renesas@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7795.dtsi

@@ -81,6 +81,11 @@
 			#power-domain-cells = <0>;
 		};
 
+		pfc: pfc@e6060000 {
+			compatible = "renesas,pfc-r8a7795";
+			reg = <0 0xe6060000 0 0x50c>;
+		};
+
 		dmac0: dma-controller@e6700000 {
 			/* Empty node for now */
 		};