arm64: dts: renesas: ebisu: Add serial console pins

This patch adds pin control for SCIF2 on R8A77990 E3 Ebisu.
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts

@@ -421,6 +421,11 @@ sound_clk_pins: sound_clk {
 		function = "audio_clk";
 	};
 
+	scif2_pins: scif2 {
+		groups = "scif2_data_a";
+		function = "scif2";
+	};
+
 	usb0_pins: usb {
 		groups = "usb0_b", "usb0_id";
 		function = "usb0";
@@ -493,6 +498,9 @@ &rwdt {
 };
 
 &scif2 {
+	pinctrl-0 = <&scif2_pins>;
+	pinctrl-names = "default";
+
 	status = "okay";
 };