DMA of ABOX IP

This device is an audio subsystem of Exynos AP

Required properties:

- compatible : "samsung,abox-ddma", "samsung,abox-dual", "samsung,abox-udma-rd",
  "samsung,abox-udma-wr", "samsung,abox-udma-wr-dual", "samsung,abox-udma-wr-debug".

- reg : address of SFR.

- reg-names : "sfr".

- samsung,id : id of the DMA.

- samsung,buffer_type : type of the DMA buffer. "dma", "ion", "ram".

- #sound-dai-cells : 0

- sound-name-prefix : prefix of the DMA. It should start with "ABOX"

Optional properties: no optional property.