ARM: dts: ls1021a: Enable the esdhc

Ls1021a esdhc had been enabled in uboot,
but it had not been enabled it in kernel,
So set the esdhc's status to "okay".

Signed-off-by: yinbo.zhu <yinbo.zhu@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a-twr.dts

@@ -228,6 +228,10 @@
 	};
 };
 
+&esdhc {
+        status = "okay";
+};
+
 &sai1 {
 	status = "okay";
 };