ARM: dts: imx: b850v3: Define GPIO line names

Define GPIO line names for gpio4.

Signed-off-by: Ian Ray <ian.ray@gehealthcare.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: iangehc

arch/arm/boot/dts/nxp/imx/imx6q-b850v3.dts

@@ -53,6 +53,18 @@
 	};
 };
 
+&gpio4 {
+	gpio-line-names =
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "PWGIN", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "",
+		"", "", "", "";
+};
+
 &hdmi {
 	ddc-i2c-bus = <&mux2_i2c1>;
 };