Bluetooth-Wipower: Avoid advertisement on USB connect.

Following changes have been made:
a> Advertisement seen after USB connection, Charge complete ensures
   power apply event is only triggered on 600ms long beacons.
b> Limited mode advetisement interval is reduced to 5seconds.
c> NULL validation been made to avoid unnecessary crashes.

Change-Id: Ie9e31a905674b98a429dca5a25910d62a9f51150
CRs-fixed: 749930
1 file changed