aspeed: Cleanup ast2500-u-boot.dtsi Device Tree

Remove unnecessary apb and ahb nodes and just override necessary
nodes/values.

Signed-off-by: Maxim Sloyko <maxims@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/ast2500-u-boot.dtsi b/arch/arm/dts/ast2500-u-boot.dtsi
index f826646..7f80bad 100644
--- a/arch/arm/dts/ast2500-u-boot.dtsi
+++ b/arch/arm/dts/ast2500-u-boot.dtsi
@@ -34,34 +34,35 @@
 
 		apb {
 			u-boot,dm-pre-reloc;
-
-			timer: timer@1e782000 {
-				u-boot,dm-pre-reloc;
-			};
-
-			uart1: serial@1e783000 {
-				clocks = <&scu PCLK_UART1>;
-			};
-
-			uart2: serial@1e78d000 {
-				clocks = <&scu PCLK_UART2>;
-			};
-
-			uart3: serial@1e78e000 {
-				clocks = <&scu PCLK_UART3>;
-			};
-
-			uart4: serial@1e78f000 {
-				clocks = <&scu PCLK_UART4>;
-			};
-
-			uart5: serial@1e784000 {
-				clocks = <&scu PCLK_UART5>;
-			};
 		};
+
 	};
 };
 
+&uart1 {
+	clocks = <&scu PCLK_UART1>;
+};
+
+&uart2 {
+	clocks = <&scu PCLK_UART2>;
+};
+
+&uart3 {
+	clocks = <&scu PCLK_UART3>;
+};
+
+&uart4 {
+	clocks = <&scu PCLK_UART4>;
+};
+
+&uart5 {
+	clocks = <&scu PCLK_UART5>;
+};
+
+&timer {
+	u-boot,dm-pre-reloc;
+};
+
 &mac0 {
 	clocks = <&scu PCLK_MAC1>, <&scu PLL_D2PLL>;
 };