Clear storage on bluetooth factory reset

This CL makes BT factory reset removes all files/directories under
- /data/misc/bluedroid/
- /data/misc/bluetooth/

Bug: 359583862
Bug: 373284699
Test: atest AdapterServiceTest
Test: Manual, clicked 'Reset Bluetooth & Wifi' and checked
      the cache/hash files are deleted.
Change-Id: I969ae986e1afd32e91528424dc27a3016a0e8b58