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This set of patches introduces the concept of a virtual FE dai link.
Previously, when trying to enable the hostless pipeline, it was
discovered that the codec does not get enabled and the tone remained inaudible.
Therefore, in such cases, a virtual FE dai link will be used to establish
a connection to the BE dai and enable the codec when the pipeline is triggered.
The virtual FE will be created when a siggen widget is loaded and freed when
the siggen widget is unloaded. It will be used for enabling the BE dai in the
kcontrol IO handler for the kcontrol attached to the siggen by calling
the soc_spcm_runtime_update() method.