Show bonded devices in "Pair new device"(1/2)

Some users forgot they had paired devices and couldn't see their BT device
when they search device in "Pair new device". (b/80382940, b/80133137).
Need to change the behavior to let paired devices can be shown on "Available devices".

Bug: 111738593
Test: Bluetooth Pairing Test
Change-Id: Iff0b40e422230fca9a3287bba4a3c4c7c4ce9cc0