Add aaudio basic test to postsubmit tests.

The aaudio basic test was added by using regex match. However, this
does not work when running test mapping. List all the functions in
postsubmit section now.

Bug: 244214753
Test: atest --test-mapping frameworks/av/media/libaaudio:postsubmit
Test: atest --test-mapping frameworks/av/media/libaudioclient:postsubmit
Test: atest --test-mapping frameworks/av/media/libaudiofoundation:postsubmit
Test: atest --test-mapping frameworks/av/media/libaudiohal:postsubmit
Test: atest --test-mapping frameworks/av/media/libaudioprocessing:postsubmit
Test: atest --test-mapping frameworks/av/services/audioflinger:postsubmit
Test: atest --test-mapping frameworks/av/services/audiopolicy:postsubmit
Change-Id: Ib6fa3ff4d20470a7fccc87394cbddc7b89794d0d