RDMA/umem: Support importing dma-buf as user memory region

Dma-buf is a standard cross-driver buffer sharing mechanism that can be
used to support peer-to-peer access from RDMA devices.

Device memory exported via dma-buf is associated with a file descriptor.
This is passed to the user space as a property associated with the buffer
allocation. When the buffer is registered as a memory region, the file
descriptor is passed to the RDMA driver along with other parameters.

Implement the common code for importing dma-buf object and mapping dma-buf
pages.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jianxin Xiong <[email protected]>
Reviewed-by: Sean Hefty <[email protected]>
Acked-by: Michael J. Ruhl <[email protected]>
Acked-by: Christian Koenig <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

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