UBUNTU: SAUCE: (noup) megaraid_sas: Don't issue kill adapter for MFI controllers in case of PD list DCMD failure

BugLink: http://bugs.launchpad.net/bugs/1552903

http://marc.info/?l=linux-scsi&m=145760492231010&w=2

There are few MFI adapters which do not support MR_DCMD_PD_LIST_QUERY so
if MFI adapters fail this DCMD, it should not be considered as FATAL and
driver should not issue kill adapter and set per controller's instance
variable- pd_list_not_supported so that same variable can be used inside
functions- slave_alloc and slave_configure to allow firmware scan.

Killing adapter because of DCMD failure when this DCMD is not supported
causes driver's probe getting failed. This issue got introduced because
of below commit when MFI IO timeout handling was introduced-

6d40afbc megaraid_sas: MFI IO timeout handling

Killing adapter in case of this DCMD failure should be limited to Fusion
adapters only. Per controller's instance variable allow_fw_scan is removed
as pd_list_not_supported better reflect the purpose.
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>