ARM: mmp: add more compatible names in gpio driver

Since more driver names are added into platform id, do the same thing on
compatible names for DT mode.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/mmp2.dtsi

@@ -160,7 +160,7 @@
 			};
 
 			gpio@d4019000 {
-				compatible = "mrvl,mmp-gpio";
+				compatible = "marvell,mmp2-gpio";
 				#address-cells = <1>;
 				#size-cells = <1>;
 				reg = <0xd4019000 0x1000>;