DO NOT MERGE Bluetooth: Cleanup bt_config.xml during BLE Scan

BLE Scan needs to clean up the bt_config.xml periodically so that
new entries could be added to bt_config.xml. Also, there is no
need to add BLE Random bd_addr to the bt_config.xml

Change-Id: I00ba2e50dd39a021099052cb569786f6cb2cc8b9

b/12912008
(cherry picked from commit b4ddfb0d)

Change-Id: I3fa0286c96782822a8fdac14b05bbb6f98636e50