ARM: socfpga: dts: enable UART1 for the debug uart

Arria10 devkit is using UART1 for the debug uart port. Remove
unused aliases.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
---
v2: Add removal of unused aliases
diff --git a/arch/arm/boot/dts/socfpga_arria10_socdk.dts b/arch/arm/boot/dts/socfpga_arria10_socdk.dts
index 3015ce8..811a61c 100755
--- a/arch/arm/boot/dts/socfpga_arria10_socdk.dts
+++ b/arch/arm/boot/dts/socfpga_arria10_socdk.dts
@@ -40,9 +40,9 @@
 				};
 			};
 		};
-
-		serial0@ffc02000 {
-			status = "okay";
-		};
 	};
 };
+
+&uart1 {
+	status = "okay";
+};