Bluetooth: Handle variable while BT turns ON from BLE ON

This change handles the member variable mEnable and sets
it explicitly to true to when Bluetooth switches from
STATE_BLE_ON to ON state. This variable describes the
transient state of Bluetooth adapter, and profile such
as headset profile, depend on this variable before a
successful bind.

CRs-Fixed: 918503
Change-Id: I992a34452c58cfcc2e4d9cdf29b8e82d31e285e4