ARM: dts: armada-xp: add label to sdram-controller node

Add the label "sdramc" to the sdram-controller nodes for the Armada-XP
and 98dx3236 SoCs.

Signed-off-by: Chris Packham <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

arch/arm/boot/dts/armada-xp-98dx3236.dtsi

···
 		};
 
 		internal-regs {
-			sdramc@1400 {
+			sdramc: sdramc@1400 {
 				compatible = "marvell,armada-xp-sdram-controller";
 				reg = <0x1400 0x500>;
 			};

arch/arm/boot/dts/armada-xp.dtsi

···
 		};
 
 		internal-regs {
-			sdramc@1400 {
+			sdramc: sdramc@1400 {
 				compatible = "marvell,armada-xp-sdram-controller";
 				reg = <0x1400 0x500>;
 			};