arm64: dts: r8a7796: salvator-x: add serial console pins

Adds pin control for SCIF2.
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7796-salvator-x.dts

@@ -31,11 +31,27 @@ memory@48000000 {
 	};
 };
 
+&pfc {
+	pinctrl-0 = <&scif_clk_pins>;
+	pinctrl-names = "default";
+
+	scif2_pins: scif2 {
+		groups = "scif2_data_a";
+		function = "scif2";
+	};
+	scif_clk_pins: scif_clk {
+		groups = "scif_clk_a";
+		function = "scif_clk";
+	};
+};
+
 &extal_clk {
 	clock-frequency = <16666666>;
 };
 
 &scif2 {
+	pinctrl-0 = <&scif2_pins>;
+	pinctrl-names = "default";
 	status = "okay";
 };