Unpair both transports of dual mode device, when LE address provided

In bta_dm_remove_device, if the device is not connected, and we don't
know the transport for given address, we make two calls to
BTM_ReadConnectedTransportAddress, to determine the device address on
the other transport.
If the address provided is LE, first call will fill the other_address
variable with the Classic address, and the second call will fill it back
with LE addres. This mean we never try to remove Classic entry, instead
we remove LE entry twice.

Bug: 67907612
Test: establish LE connnection between two phones, trigger Bonding.
  After bonding complete, try to remove bond using LE address. Verify
  config file is cleaned of both LE and classic entry.

Change-Id: Ia5dd53f96b95478a07009cecc5b4a3c79f15c59b