codec2: VTS add support for Empty EOS in VideoEnctest

Test: VtsHidlC2V1_0TargetVideoEncTest -I software -P /sdcard/res/ -C c2.android.avc.encoder
Bug: 127691941
Change-Id: I0c72075eca0fb2f4f22c5c25b4e64a749ddb35c3
1 file changed