In STA+STA case, if SSR happens, driver will clear the
no_of_active_sessions = 0 at the beginning of wlan shutdown
by policy_mgr_clear_concurrent_session_count.
In the shutdown process, one STA will be disconnected and
in the setting PCL of second STA, the no_of_active_sessions
will be decreased to 255 from 0
in policy_mgr_store_and_del_conn_info.
Fix by move the policy_mgr_clear_concurrent_session_count
to policy mgr enable/disable.
Change-Id: I70bcc60fe3030db71376a626d6f9625fe299417d
CRs-Fixed: 3063772
3695cd3f8e