ARM: zynq: Add sdhci to alias node

Ensure that controller will all the time use the same ID.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/9fa60b57e038d51ae6677fac6628ecd663ddd2cd.1733920873.git.michal.simek@amd.com

arch/arm/boot/dts/xilinx/zynq-microzed.dts

@@ -14,6 +14,7 @@ aliases {
 		ethernet0 = &gem0;
 		serial0 = &uart1;
 		spi0 = &qspi;
+		mmc0 = &sdhci0;
 	};
 
 	memory@0 {

arch/arm/boot/dts/xilinx/zynq-zybo-z7.dts

@@ -11,6 +11,7 @@ aliases {
 		ethernet0 = &gem0;
 		serial0 = &uart1;
 		spi0 = &qspi;
+		mmc0 = &sdhci0;
 	};
 
 	memory@0 {