apps: lc-compliance: Support multiple streams in helpers

Prepare to add a test suite for capture operations with multiple
streams.

Modify the Capture helper class to support multiple roles and streams
in the configure() and capture() operations. The buffer count
of each stream is asserted to be the same.

Multi-stream support will be added in next patches.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

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