arm: dts: keystone: Move to OF_UPSTREAM

Enable OF_UPSTREAM for Keystone boards. Remove DT files that
are now available in dts/upstream.

Signed-off-by: Andrew Davis <afd@ti.com>
Acked-by: Neha Malcom Francis <n-francis@ti.com>
diff --git a/arch/arm/dts/keystone-k2e-evm-u-boot.dtsi b/arch/arm/dts/keystone-k2e-evm-u-boot.dtsi
index 953c750..e77c53d 100644
--- a/arch/arm/dts/keystone-k2e-evm-u-boot.dtsi
+++ b/arch/arm/dts/keystone-k2e-evm-u-boot.dtsi
@@ -4,15 +4,23 @@
  */
 
 /{
-	soc {
-		bootph-all;
-	};
 	aliases {
 		usb0 = &usb;
 		usb1 = &usb1;
+		i2c0 = &i2c0;
+		i2c1 = &i2c1;
+		i2c2 = &i2c2;
+	};
+
+	chosen {
+		stdout-path = &uart0;
 	};
 };
 
+&soc0 {
+	bootph-all;
+};
+
 &i2c1 {
 	bootph-all;
 };