dt: bcm968580xref: enable gpio controller

Enable all the gpio controllers in the device tree
of the board bcm968580xref.
Signed-off-by: NPhilippe Reynes <philippe.reynes@softathome.com>

arch/arm/dts/bcm968580xref.dts

@@ -29,3 +29,35 @@
 	u-boot,dm-pre-reloc;
 	status = "okay";
 };
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gpio2 {
+	status = "okay";
+};
+
+&gpio3 {
+	status = "okay";
+};
+
+&gpio4 {
+	status = "okay";
+};
+
+&gpio5 {
+	status = "okay";
+};
+
+&gpio6 {
+	status = "okay";
+};
+
+&gpio7 {
+	status = "okay";
+};