Remove aliase name while removing bonded device

when remove a bonded device, the date in bt_config.conf
is deleted but only removed linkey in the global cache.
The user set alise name is left there

When comes to next time search ,the linkey is set to
config and write to bt_config.conf, before OFF/ON BT
operation, the cached alse name is reported unexceptedly

After remove,the remote device is expected to be brand
new to the phone in the 2nd time they see each other.

Test: mm -j8
Change-Id: I005a6487c546e2639e3180e8a6e181c4d3c1d4ac