codec2: add C2SoftHevcEnc

Test: screenrecord --codec-name c2.android.hevc.encoder /sdcard/record.mp4
Test: cts-tradefed run cts -m CtsMediaTestCases \
 -t android.media.cts.VideoEncoderTest

Bug: 110456253
Change-Id: I014f0d2b9cb94f8e81df4c8ae3dc41a8550033e6
6 files changed