[SCSI] mptfusion: Remove bus reset for mptsas module

Bus reset is not required for SAS Controller. It is valid for mptspi
and mptfc, but for mptsas it is not required. It is an extra work for
Error handling escallation for mptsas.  Removing bus reset from error
handling will eventually speedup Error handling for SAS controller.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>