Populate remote device name from properties if available

BTM creates device records from bonded devices at the time of
initiatlization. The remote device name is kept empty in these records
even though they are available in properties.

Test: mmm packages/modules/Bluetooth
Test: Manual | Bond with a remote device, restart Bluetooth, forget bond
from the remote device, initiate reconnection, pairing dialog box must
show correct name
Flag: com.android.bluetooth.flags.name_discovery_for_le_pairing
Bug: 346365430
Bug: 355095011

Change-Id: Ia47a912c3ccd36527349ec71d78d7d41fe570ea0