leaudio: Fix choosing configuration based on ase cnt

We could end up with incorrect configuration because ase cnt was not
verified.

Bug: 238588139
Test: atest BluetoothInstrumentationTests
Test: PTS  BAP/UCL/STR/BV-040-C
Tag: #feature
Merged-In: Ibe448ae24adaffcaee490615977c7d46488dbb09
Change-Id: Ibe448ae24adaffcaee490615977c7d46488dbb09
(cherry picked from commit c41820ea)