ARM: uniphier: enable eMMC on PH1-sLD3 reference board

On PH1-sLD3, eMMC and NAND are assigned to different I/O pins.
Both devices can be enabled at the same time.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/dts/uniphier-ph1-sld3-ref.dts

@@ -57,6 +57,10 @@
 	status = "okay";
 };
 
+&emmc {
+	status = "okay";
+};
+
 &sd {
 	status = "okay";
 };