CodecEncoderTest: add tests for force keyframe, dynamic bitrate change

Bug: 147573846
Test: atest android.mediav2.cts.CodecEncoderTest

Change-Id: Ib8950e6ca74ec7a78baa12f0d1710ade46740184
Merged-In: Ib8950e6ca74ec7a78baa12f0d1710ade46740184
1 file changed