axolotl: media: Adjust performance rates for various codecs

Based on the latest results, adjust the rates as expected and
reported by the system.

Test: run cts -m CtsMediaDecoderTestCases -t android.media.decoder.cts.VideoDecoderPerfTest
Change-Id: I3ddd9fc4f3bfee0698de880d11b64ac9f474875b