drivers: dma: Add SOF host DMA driver

This commit introduces the SOF host DMA driver.
This driver is used by NXP platforms in the context of
SOF's host component to copy data from the host memory
to the firmware (local) memory. This is possible because
NXP platforms can access the host memory directly w/o
an actual DMA engine.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>