arm64: dts: imx8mq: Add mmc aliases

Add mmc aliases for kernel usage
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq.dtsi

@@ -29,6 +29,8 @@ aliases {
 		i2c1 = &i2c2;
 		i2c2 = &i2c3;
 		i2c3 = &i2c4;
+		mmc0 = &usdhc1;
+		mmc1 = &usdhc2;
 		serial0 = &uart1;
 		serial1 = &uart2;
 		serial2 = &uart3;