vfio/ccw: replace copy_from_iova with vfio_dma_rw

It was suggested [1] that we replace the old copy_from_iova() routine
(which pins a page, does a memcpy, and unpins the page) with the
newer vfio_dma_rw() interface.

This has a modest improvement in the overall time spent through the
fsm_io_request() path, and simplifies some of the code to boot.

[1] https://lore.kernel.org/r/[email protected]/

Suggested-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Eric Farman <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Matthew Rosato <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

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