AudioService: add TEST_MAPPING for pre-submit tests

  Run AudioManager and AudioFocus CTS tests whenever a class
in audio service is changed.

Bug: 139315190
Test: verify this change caused those tests to be run during presubmit
Change-Id: I17a49fad6856ae28ef1951d64a43b04f44be4079
Merged-In: I17a49fad6856ae28ef1951d64a43b04f44be4079