soundwire: stream: sdw_stream_add_ functions can be called multiple times

The sdw_stream_add_slave/master() functions are called from the
.hw_params stage. We need to make sure the functions can be called
multiple times.

In this version, we assume that only 'audio' parameters provide in the
hw_params() can change. If the number of ports could change
dynamically depending on the stream configuration (number of channels,
etc), we would need to free-up all the stream resources and reallocate
them.

Signed-off-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Rander Wang <[email protected]>
Signed-off-by: Bard Liao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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