ASoC: SOF: compress: Add support for timestamp on capture

Merge series from Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>:

The purpose of this patch series is to add support for
timestamping on capture direction using the compress
API.

This is simply done by splitting sof_compr_copy into 2
functions: sof_compr_copy_playback and sof_compr_copy_capture.
Each of these functions handles one of the possible directions:
capture or playback and is called in sof_compr_copy based on
the stream's direction.

The only difference between sof_compr_copy_playback and
sof_compr_copy_capture is the fact that on playback case
we need to copy data from user space and on capture we
need to copy data to user space.