Do not stop ongoing sched scan if started by external entities

PNO is stopped by the supplicant during the connection attempts or while
handling disassoc indication. External entities does not expect PNO to
be stopped by supplicant. Hence, do not stop the PNO in these scenarios
if it is triggered externally.

Change-Id: I52052d393a8656492299fd409fe5d36b128c2983
CRs-Fixed: 860635
2 files changed