Revert "remove getName() from CachedBluetoothDeviceManager"

This reverts commit c386c87b.

Reason for revert:
To fix null pointer crash in Pairing dialog. Dialog maybe triggered by intent, in which LocalBluetoothManager couldn't have instance for BluetoothDevice and will return null. As a result, we need to depend on method in CachedBluetoothManager to handle it.

Bug: 115754654
Bug: 112735753
Change-Id: I727089cfd23819f292f96f0d0232f35bc6ebac64