ARM: dts: keystone: Add clock tree data to devicetree

Add clock tree for Keystone 2 based SOCs.

Cc: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/boot/dts/keystone.dts

@@ -100,6 +100,8 @@ rstctrl: reset-controller {
 			reg = <0x023100e8 4>;	/* pll reset control reg */
 		};
 
+		/include/ "keystone-clocks.dtsi"
+
 		uart0: serial@02530c00 {
 			compatible = "ns16550a";
 			current-speed = <115200>;