Audio: Remove DMA operations from simulated Zephyr DAI

With this change the DAI just consumes all playback samples
and produces capture samples.

In the playback direction the consumed samples are checked for
glitches. The detection traces a warning when sample differs
from previous PCM code value with more than 1.

In the capture direction the generated PCM samples are triangle
waveform where every sample is incremented by 1. If maximum
PCM value is reached the samples are decremented. In beginning even
channels count up and odd channels count down.

Signed-off-by: Seppo Ingalsuo <[email protected]>