Realtek I2S controller

Required properties:
- compatible: Should be "realtek,<soctype>-adai"
	Examples with soctypes are:
	- "realtek,rts3903-adai" for RTS3903/RTS3904/RTS3913/RTS3914
	- "realtek,rts3915-adai" for RTS3915/RTS3916
- reg: physical base address of the I2S controller and length of memory mapped
region
- resets: List of phandle and reset specifier pairs, one pair for
each reset signal that affects the device
- reset-names: List of reset signal name strings sorted in the same order as
the resets property

Example:

	audio_i2s: audio_i2s@18500064 {
		compatible = "realtek,rts3903-adai";
		reg = <0x18500064 0xc 0x185000D4 0x4 0x185000E0 0x4>;
		resets = <&reset FORCE_RESET_I2S>,	\
				<&reset FORCE_RESET_SPDIF>;
		reset-names = "reset-i2s", "reset-spdif";
		status = "disabled";
	};
