libmediatranscoding: Run tests with atest

Updated AndroidTestTemplate.xml to push test binaries to /data/local/tmp/
Transcoder tests can now be run with atest

Bug: 173627260
Test: Disable address sanitizer in libmediatranscoder
Test: push libmediatranscoder.so to /system/lib64
Test: atest MediaTrackTranscoderTests
Test: atest MediaTranscoderTests
Test: atest MediaSampleQueueTests

Change-Id: I803e7ddc89ff73fd36cbe9e85b46753a84f6be1d