arm: socfpga: Make the DT mmc node consistent

The socfpga_cyclone5.dtsi has an mmc0 node, socrates has mmc node.
This makes aliases not very usable, so make everything into mmc0.
Moreover, zap the useless mmc alias while at this.

Signed-off-by: Marek Vasut <marex@denx.de>

arch/arm/dts/socfpga.dtsi

@@ -23,7 +23,6 @@
 		spi0 = &qspi;
 		spi1 = &spi0;
 		spi2 = &spi1;
-		mmc = &mmc;
 	};
 
 	cpus {
@@ -621,7 +620,7 @@
 			arm,data-latency = <2 1 1>;
 		};
 
-		mmc: dwmmc0@ff704000 {
+		mmc0: dwmmc0@ff704000 {
 			compatible = "altr,socfpga-dw-mshc";
 			reg = <0xff704000 0x1000>;
 			interrupts = <0 139 4>;

arch/arm/dts/socfpga_cyclone5_socrates.dts

@@ -34,7 +34,7 @@
 	};
 };
 
-&mmc {
+&mmc0 {
 	status = "okay";
 };