[Sound-open-firmware] CNL/APL alignment

[Pierre-Louis Bossart]

Looking at the code and latest patches I see quite a few differences 
between APL and CNL that makes no sense to me.

1. why would use a workqueue based on SSP (APL) and CPU (CNL)?
2. why would we initialize the SSP to 25MHz for CNL? It's clearly not a 
supported frequency, 25MHz can only be reached on BYT and CHT. On a 
similar note not sure why APL makes a reference to 24 MHz, it should be 
24576000.
3. why would we use DMAC class 1/2 on APL and class 6/7 on CNL?


Conversely I always thought there were differences in the HDaudio DMA 
channel count between APL and CNL, so can we really share common 
definitions in src/drivers/hda-dma.c ?

Thanks
-Pierre