Do not enable memory windows allocation for virtual functions.

In addition, add a few safety checks, such as:

* Verifying the PD of a new MPT matches the VF.
* Making sure binding memory window isn't enabled for FMRs, and
  that new memory windows are not FMR themselves.
Signed-off-by: NHaggai Eran <haggaie@mellanox.com>
Signed-off-by: NShani Michaeli <shanim@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NRoland Dreier <roland@purestorage.com>