ARM: dts: k2hk-evm: rename clock node to clocks

Fix typo in clock(s) node name: "clock"-->"clocks".

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/boot/dts/k2hk-evm.dts

@@ -15,7 +15,7 @@
 	compatible =  "ti,keystone-evm";
 
 	soc {
-		clock {
+		clocks {
 			refclksys: refclksys {
 				#clock-cells = <0>;
 				compatible = "fixed-clock";