ASoC: SOF: core/Intel: Handle pause supported token

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

A new set of tokens have been added to SOF topology to indicate that the pause
operation is supported or not on the given PCM device.
Pause is an optional feature that depends on pipeline, topology and modules
used by the PCM.

Add a pause_supported flag to snd_sof_pcm_stream and use this flag in Intel
platform code to keep the pause support enabled or to disable it.