dma/skeleton: introduce skeleton driver

Skeleton dmadevice driver, on the lines of rawdev skeleton, is for
showcasing of the dmadev library.

Design of skeleton involves a virtual device which is pl

dma/skeleton: introduce skeleton driver

Skeleton dmadevice driver, on the lines of rawdev skeleton, is for
showcasing of the dmadev library.

Design of skeleton involves a virtual device which is plugged into VDEV
bus on initialization.

Also, enable compilation of dmadev skeleton drivers.

Signed-off-by: Chengwen Feng <[email protected]>
Reviewed-by: Kevin Laatz <[email protected]>
Reviewed-by: Conor Walsh <[email protected]>

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