[SCSI] fnic: enable bsg pass-thru for fcping

Add initialization of .bsg_request in the scsi_transport_fc
template so that fcping works.

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>