C2Soft Enc: Use correct matrix and range in RGB to YUV conversion

Update avc, hevc, vp8 and vp9 encoders to pick correct conversion matrix
and range during YUV to RGB conversion.

Test: atest android.mediav2.cts.EncodeDecodeAccuracyTest
Bug: 170747332
Change-Id: I7e69e6fc24e4284d9945d8a214c2e265bb1da612
4 files changed