ddr: Disable the dmc function.

Change-Id: I340eda4f68731bdfb5e4ea03df0e86a8847f2701

Author: tzuhsuan12

arch/arm/boot/dts/rk3288-tinker-board.dts

@@ -343,15 +343,6 @@
 	};
 };
 
-&dfi {
-	status = "okay";
-};
-
-&dmc {
-	center-supply = <&vdd_log>;
-	status = "okay";
-};
-
 &edp {
 	status = "disabled";
 };