Use user settings for BT permissions

If the BluetoothAdapter is unavailable, use the user settings to
determine CHRE's BT permissions.

Bug: 302590029
Test: Verify if Bluetooth Scanning is enabled and BT is disabled,
Bluetooth Scanning will be propagated to CHRE as enabled after rebooting

Change-Id: I0f15ae080e045c2205bae9f270727742593d004e