Benchmark: Add SDK Encoder

Test: adb shell am instrument -w -r -e class\
      'com.android.media.benchmark.tests.EncoderTest'\
      com.android.media.benchmark/androidx.test.runner.AndroidJUnitRunner

Bug: 140051680

Change-Id: Id9642a8806de128e6ce1eff77bea12bc86bb6cbb
3 files changed