NVIDIA Tegra124 AHUB (Audio Hub)

Required properties:
- compatible : "nvidia,tegra124-ahub"
- reg : Should contain the register physical address and length for each of
  the AHUB's APBIF registers, the AHUB's own registers and the AHUB's APBIF2
  registers.
- interrupts : Should contain AHUB interrupt
- nvidia,dma-request-selector : The Tegra DMA controller's phandle and
  request selector for each APBIF channels. Should have 10 of apbdma phandles.
- ranges : The bus address mapping for the configlink register bus.
  Can be empty since the mapping is 1:1.
- #address-cells : For the configlink bus. Should be <1>;
- #size-cells : For the configlink bus. Should be <1>.

I2S, DAM and SPDIF in AHUB client modules need to specify the IDs of their
CIFs (Client InterFaces).
For RX CIFs, the numbers indicate the register number within AHUB routing
register space (APBIF 0..3 RX, I2S 0..5 RX, DAM 0..2 RX 0..1, SPDIF RX 0..1).
For TX CIFs, the numbers indicate the bit position within the AHUB routing
registers (APBIF 0..3 TX, I2S 0..5 TX, DAM 0..2 TX, SPDIF TX 0..1)

Example:

ahub@70300000 {
	compatible = "nvidia,tegra124-ahub";
	reg = <0x70300000 0x200>,
			<0x70300800 0x800>,
			<0x70300200 0x200>;
	interrupts = < 0 103 0x04 >;
	nvidia,dma-request-selector = <&apbdma 1>, <&apbdma 2>,
		<&apbdma 3>, <&apbdma 4>, <&apbdma 6>, <&apbdma 7>,
		<&apbdma 12>, <&apbdma 13>, <&apbdma 14>, <&apbdma 29>;

	ranges;
	#address-cells = <1>;
	#size-cells = <1>;
};
