greybus: audio: Maintain runtime stream params for each DAI

Runtime streams are required while configuring GB module plugged-in
during active stream. Currently, it is maintained for single stream.
However, this should be maintained for a stream corresponding to each
DAI. Fix this!

Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>