IB/mlx5: Improve MR check

Add "type" field to mlx5_core MKEY struct.
Check whether page fault happens on MKEY corresponding to MR.

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>