Unset device trust state before unpairing.
Unset device trust state before unpairing.

a) Device is trusted.
b) Device is unpaired.
c) We need to set the trusted value before unpairing.

Else on the next pairing, the device will be trusted automatically
and we will not show the PBAP authentication dialog.

Change-Id: I8d7c962688885885d37be341e5494069294eb392

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base