dma/cavs_hda: DMA driver for HDA on cAVS

Adds an initial driver for HDA streams on cAVS. A common code base is
provided for all HDA streams while the drivers are identified
differently as they have small behavior differences.

Uses dma_status to describe the positions for read/write. Uses dma_reload
to inform when to move the read/write positions. This closely follows
how HDA is being used in SoF

Simple test case is provided for both drivers.

Signed-off-by: Tom Burdick <thomas.burdick@intel.com>