Remove the old SAP-CSR flow for start bss, stop bss and
channel change req processing which is disabled currently
under the SAP_CP_CLEANUP macro.
Cleanup the redundant checks in the deauth, disassoc
response processing in CSR.
Change-Id: I5a360fc267688b51ca645551108b65646a3c8c1a
CRs-Fixed: 3164259