ARM: dts: mstar: Set gpio compatible for ssd20xd

Now there is gpio support for ssd20xd set the right compatible in the gpio node.
Signed-off-by: NDaniel Palmer <daniel@0x0f.com>
Reviewed-by: NRomain Perier <romain.perier@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/mstar-infinity2m-ssd20xd.dtsi

@@ -6,6 +6,11 @@
 
 #include "mstar-infinity2m.dtsi"
 
+&gpio {
+	compatible = "sstar,ssd20xd-gpio";
+	status = "okay";
+};
+
 &smpctrl {
 	compatible = "sstar,ssd201-smpctrl", "mstar,smpctrl";
 	status = "okay";