Fix Bluetooth auto turns ON in airplane mode

Fix a race condition that mBleApps is cleared while turning ON BLE,
this causes Bluetooth turns on classic profiles instead of stays in
BLE_ON state.

Bug: 142220937
Test: enableBle() -> turn on airplane mode, check Bluetooth does not
      turn to ON.
Change-Id: I3cea5384f734dde269cf93a93ed7cc4173f669a0