Enable PTS tests A2DP/SNK/AVP/*

The test A2DP/SNK/AVP/BI-07-C is skipped due
to a bug in the PTS test execution (the PTS is sending
an incorrect configuration leading).

Bug: 336232163
Test: atest pts-bot:A2DP
Flag: EXEMPT, test change
Change-Id: I63000375d1c2dbc14537f596cbcb17044a6a6b07