ARM: socfpga: dts: Fix gpio dts entry for the correct clock

The correct clock for the HPS gpio(s) should be the l4_mp_clk.
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/boot/dts/socfpga.dtsi

@@ -565,7 +565,7 @@ gpio0: gpio@ff708000 {
 			#size-cells = <0>;
 			compatible = "snps,dw-apb-gpio";
 			reg = <0xff708000 0x1000>;
-			clocks = <&per_base_clk>;
+			clocks = <&l4_mp_clk>;
 			status = "disabled";
 
 			porta: gpio-controller@0 {
@@ -585,7 +585,7 @@ gpio1: gpio@ff709000 {
 			#size-cells = <0>;
 			compatible = "snps,dw-apb-gpio";
 			reg = <0xff709000 0x1000>;
-			clocks = <&per_base_clk>;
+			clocks = <&l4_mp_clk>;
 			status = "disabled";
 
 			portb: gpio-controller@0 {
@@ -605,7 +605,7 @@ gpio2: gpio@ff70a000 {
 			#size-cells = <0>;
 			compatible = "snps,dw-apb-gpio";
 			reg = <0xff70a000 0x1000>;
-			clocks = <&per_base_clk>;
+			clocks = <&l4_mp_clk>;
 			status = "disabled";
 
 			portc: gpio-controller@0 {