[SCSI] bfa: Move debugfs initialization before bfa init.

Move the initialization of debugfs before bfa init, to enable us to
collect driver/firmware traces if init fails.  Also add a printk to
display message on bfa_init failure.

Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>