media: separate quality and performance tests for encoders and decoders

remove unused tests to speed up test runs
- don't decode during encoder performance tests
- encode only once when using all decoders during encoder quality tests
- don't decode to bytebuffers during decoder performance tests

- get codecs by fuller format
- move performance related code into deviceutil.MediaPerfUtils
- report encoder and decoder performance in a uniform fashion
- keep frame-time statistics in micro-seconds (as we report in them)

Bug: 28752802
Change-Id: I74a2beebc590230b99ad0e039bcc41b929fb106b
4 files changed