arm: dts: socfpga: align mmc node names with dtschema

dwmmc0@ff704000: $nodename:0: 'dwmmc0@ff704000' does not match '^mmc(@.*)?$'

Signed-off-by: Dinh Nguyen <[e-mail]>

arch/arm/boot/dts/socfpga.dtsi

···
 			reg = <0xff800000 0x1000>;
 		};
 
-		mmc: dwmmc0@ff704000 {
+		mmc: mmc@ff704000 {
 			compatible = "altr,socfpga-dw-mshc";
 			reg = <0xff704000 0x1000>;
 			interrupts = <0 139 4>;

arch/arm/boot/dts/socfpga_arria10.dtsi

···
 			arm,shared-override;
 		};
 
-		mmc: dwmmc0@ff808000 {
+		mmc: mmc@ff808000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "altr,socfpga-dw-mshc";

arch/arm/boot/dts/socfpga_arria5.dtsi

···
 			};
 		};
 
-		mmc0: dwmmc0@ff704000 {
+		mmc0: mmc@ff704000 {
 			broken-cd;
 			bus-width = <4>;
 			cap-mmc-highspeed;

arch/arm/boot/dts/socfpga_cyclone5.dtsi

···
 			};
 		};
 
-		mmc0: dwmmc0@ff704000 {
+		mmc0: mmc@ff704000 {
 			broken-cd;
 			bus-width = <4>;
 			cap-mmc-highspeed;

arch/arm/boot/dts/socfpga_vt.dts

···
 			};
 		};
 
-		dwmmc0@ff704000 {
+		mmc@ff704000 {
 			broken-cd;
 			bus-width = <4>;
 			cap-mmc-highspeed;