arch: arm: dts: Revert to use root

This patch is to rename mtd partition from rootubi to root.
This change is to align with the existing agilex mtd partitions.

Signed-off-by: Dinesh Maniyam <[email protected]>

Author: dineshmaniyam

arch/arm/dts/socfpga_agilex5_socdk.dts

@@ -152,7 +152,7 @@
 			reg = <0 0x200000>;
 		};
 		partition@200000 {
-			label = "rootubi";
+			label = "root";
 			reg = <0x200000 0x3fe00000>;
 		};
 	};