arm64: dts: actions: Add Reset Controller support for S900 SoC

Add reset controller property and bindings header for the
Actions Semi S900 SoC DTS.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

arch/arm64/boot/dts/actions/s900.dtsi

@@ -5,6 +5,7 @@
 
 #include <dt-bindings/clock/actions,s900-cmu.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/reset/actions,s900-reset.h>
 
 / {
 	compatible = "actions,s900";
@@ -184,6 +185,7 @@ cmu: clock-controller@e0160000 {
 			reg = <0x0 0xe0160000 0x0 0x1000>;
 			clocks = <&hosc>, <&losc>;
 			#clock-cells = <1>;
+			#reset-cells = <1>;
 		};
 
 		i2c0: i2c@e0170000 {