net/vdpa: Use readers/writers semaphore instead of vdpa_dev_mutex

Use rw_semaphore instead of mutex to control access to vdpa devices.
This can be especially beneficial in case processes poll on statistics
information.

Suggested-by: Si-Wei Liu <[email protected]>
Reviewed-by: Si-Wei Liu <[email protected]>
Acked-by: Jason Wang <[email protected]>
Signed-off-by: Eli Cohen <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

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