codec2: VTS add support for nSamplesPerFrame in AudioEnctest

Test: VtsHidlC2V1_0TargetAudioEncTest -I software -P /sdcard/res/ -C c2.android.flac.encoder
Bug: 127693424
Change-Id: Ic2c2f07314b52bb0c4febdbc3a8b044abd38f709
1 file changed