RDMA/efa: Allow passing of optional access flags for MR registration

RDMA/efa: Allow passing of optional access flags for MR registration

As part of adding a range of optional access flags that drivers need to be
able to accept, mask this range inside efa driver.  This will prevent the
driver from failing when an access flag from that range is passed.

Link: https://lore.kernel.org/r/1578506740-22188-8-git-send-email-yishaih@mellanox.com
Signed-off-by: Michael Guralnik <michaelgur@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>