RDMA/efa: Mask access flags with the correct optional range

The uapi value IB_UVERBS_ACCESS_OPTIONAL_RANGE shouldn't be used inside
the driver, use IB_ACCESS_OPTIONAL instead.

Fixes: 86dd738c ("RDMA/efa: Allow passing of optional access flags for MR registration")
Link: https://lore.kernel.org/r/20200129071803.40117-1-galpress@amazon.com


Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>