Bluetooth: Disable bluetooth only if BT Sevice is connected

Bluetooth service is imidiately disconnected from the adapter
after SSR OR if any bluetooth services is crashed OR framework
is crashed. As Bluetooth  service is not connected OR Bluetooth
is not enabled, So BT disable should be ignored & bluetooth
persist setting should not be changed.

CRs-Fixed: 499116

Change-Id: I19de939346d014cdf918e11711f2d6066e55d054