Enable unit tests for some utils in postsubmit

Enabled unit tests for avcUtils, ID3, Mpeg2Ts, OpusHeader and
ESDS in postsubmit.

These were marked as dynamic-presubmit and those are now
changed to postsubmit as these tests now use DynamicConfig.xml and
can download the required files without any extra arguments.

After some time of running these in postsubmit, these will be changed
to presubmit.

Also, updated Android.bp and AndroidTest.xml for a couple of tests
to add to the device-tests test suite and cleanup after the test.

Bug: 304383609
Test: atest AVCUtilsUnitTest ESDSTest HEVCUtilsUnitTest ID3Test \
Mpeg2tsUnitTest OpusHeaderTest

Change-Id: I8383072f47b936d78299f4a3953229c992a88b4f