dt: bcm968380gerg: enable gpio controller

Enable the gpio controllers in the device tree
of the board bcm968380gerg.
Signed-off-by: NPhilippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: NDaniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/dts/brcm,bcm968380gerg.dts

@@ -38,3 +38,15 @@
 		label = "bcm968380gerg:green:usb";
 	};
 };
+
+&gpio_lo {
+	status = "okay";
+};
+
+&gpio_mid0 {
+	status = "okay";
+};
+
+&gpio_mid1 {
+	status = "okay";
+};