Fix transport selection for BT pairing with dual mode devices

When createBond API is called with Auto Transport, BR/EDR transport is selected for pairing with the dual mode devices using the public address. This can result in pairing attempt failure if the remote device is not connectable over BR/EDR.
This change chooses transport for BT pairing based on the transport seen
during the discovery of the remote device.

Change-Id: I0bb41006049edae1144d196c2911c7f895452014
Test: atest PairingTest
Flag: com.android.bluetooth.flags.auto_transport_pairing
Bug: 388074343
Bug: 398329326