BluetoothManager: Continue when BLE not supported

Bluetooth should turn on completely (without GATT) when the chip
does not support Bluetooth Low Energy.

Bug: 77495521
Test: Remove vendor/etc/permissions/android.hardware.bluetooth_le.xml
      Reboot
      Toggle Bluetooth
Change-Id: I9314ee473b4a5a158196bab3037b1452247ba466