[SCSI] libfc: recognize incoming FLOGI for point-to-point mode

When receiving a FLOGI request from a point-to-point peer,
the D_ID of 0xfffffe was not recognized as belonging to one
of the lports, so it was dropped.

Change fc_vport_id_lookup() to treat d_id 0xfffffe as a match.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>