ASoC: Intel: avs: Fixes and cleanups

Merge series from Cezary Rojewski <cezary.rojewski@intel.com>:

A set of loosely connected changes, fixing few outstanding issues as
well as improving readability of the existing code.

The fixes lead the series, first five patches. The goal is to make sure
proper read() is used when accessing the registers, probe() and remove()
sequences for HDAudio streaming are synced, minimal AudioDSP firmware
version points to correct values and recent additions to the topology
are parsed properly.

The only patch that points to 'new functionality' is:
  ASoC: Intel: avs: Update ASRC definition

as with the struct definition updates, one can utilize the ASRC module
in both streaming directions now (previously limited to Capture).
Everything else either improves the logging or provides comments vital
for long-term maintenance of the code.