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Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>: The series adds support for echo reference functionality by allowing the capturing of playback audio right before it leaves the DSP. For this to work correctly we need a virtual DAI that is also connected to the echo reference capture device and in absence of playback a signal generator generates silence to allow the capture to run. When the real playback starts, application will start to receive the playback audio to be usable for echo reference.