make sure audio_data is stable throughout LR period
take i2c_av_config out of audio_buffer and place in top-level
Merge branch 'master' into audio_debug
fix up audio_buffer_tb
assert audio_request high a few cycles before lrck falls
audio_buffer changes data on rising edge of audio_request
add debug outputs in audio_buffer for testbench
set audio_buffer_tb as new testbench
make timing of audio codec more conformant to spec
access readdata readaddr in testbench