[SCSI] bfa: remove unused functions and misc cleanups

Remove unused functions and fix checkpatch errors. Misc cleanups in
comment and formatting.

Signed-off-by: Maggie Zhang <xmzhang@brocade.com>
Signed-off-by: Jing Huang <huangj@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>