src: dai-zephyr: copy data to all available sinks

[dnikodem]

In the case where the copier has more than one output and, additionally, we will be using a pin other than pin 0 (for example, when we want to copy data from pin 1 of a gateway-type copier to the next pipeline), it is necessary to copy data in playback path from the source to the output for all possible sinks.