scsi: mpt3sas: renamed _base_after_reset_handler function

Renamed _base_after_reset_handler function to
_base_clear_outstanding_commands so that it can be used in multiple
scenarios with suitable name which matches with the operation it does.

Also renamed its child functions. No functional changes.

Link: https://lore.kernel.org/r/20191226111333.26131-4-sreekanth.reddy@broadcom.com


Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>