dma/ioat: add device probing and removal

Add the basic device probe/remove skeleton code and initial documentation
for new IOAT DMA driver. Maintainers update is also included in this
patch.

Signed

dma/ioat: add device probing and removal

Add the basic device probe/remove skeleton code and initial documentation
for new IOAT DMA driver. Maintainers update is also included in this
patch.

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

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