[media] rc: Add DT bindings for hix5hd2

Device-Tree bindings for hix5hd2 ir IP

Required properties:

	- compatible: Should contain "hisilicon,hix5hd2-ir".

	- reg: Base physical address of the controller and length of memory

	  mapped region.

	- interrupts: interrupt-specifier for the sole interrupt generated by

	  the device. The interrupt specifier format depends on the interrupt

	  controller parent.

	- clocks: clock phandle and specifier pair.

	- hisilicon,power-syscon: phandle of syscon used to control power.

Optional properties:

	- linux,rc-map-name : Remote control map name.

Example node:

	ir: ir@f8001000 {

		compatible = "hisilicon,hix5hd2-ir";

		reg = <0xf8001000 0x1000>;

		interrupts = <0 47 4>;

		clocks = <&clock HIX5HD2_FIXED_24M>;

		hisilicon,power-syscon = <&sysctrl>;

		linux,rc-map-name = "rc-tivo";

	};