LE Audio: Prefer bonding using LE transport.

When LE Audio capable device advertises using same address on both LE
and Classic transport, prefer connecting and initial bond establishment
using LE transport.

This is helping with devices that can't do CTKD from classic to LE -
such devices are mandated by BAP specification to use same address on
both transports.

It also simplifies the service discovery handling, which will be further
improved in upcoming patches.

Bug: 246560805
Test: manual, pair with LE Audio capable device that can't CTKD
Change-Id: I91ce850e67548169b6ff645a589defee1d2509ab