ARM: dts: keystone: Update SoC specific compatible flags

Update the compatible flags to allow specific SoC identification.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index fbc4a8e..3f27282 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -12,6 +12,7 @@
 #include "skeleton.dtsi"
 
 / {
+	compatible = "ti,keystone";
 	model = "Texas Instruments Keystone 2 SoC";
 	#address-cells = <2>;
 	#size-cells = <2>;