ARM: dts: k2hk: Enable OF_CONTROL and DM

Import k2hk specific DT files from Linux Kernel and enable
OF_CONTROL, DM, DM_SERIAL.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/dts/keystone.dtsi b/arch/arm/dts/keystone.dtsi
index 9ab260f..f39b969 100644
--- a/arch/arm/dts/keystone.dtsi
+++ b/arch/arm/dts/keystone.dtsi
@@ -21,6 +21,10 @@
 		serial0	= &uart0;
 	};
 
+	chosen {
+		stdout-path = &uart0;
+	};
+
 	memory {
 		reg = <0x80000000 0x40000000>;
 	};