ARM: dts: aspeed: swift: Add eMMC device

Swift contains an eMMC device attached to the second SDHCI controller.
Reviewed-by: NAdriana Kobylak <anoo@us.ibm.com>
Signed-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-swift.dts

@@ -963,4 +963,15 @@
 	status = "okay";
 };
 
+&sdmmc {
+       status = "okay";
+};
+
+&sdhci1 {
+       status = "okay";
+
+       pinctrl-names = "default";
+       pinctrl-0 = <&pinctrl_sd2_default>;
+};
+
 #include "ibm-power9-dual.dtsi"