zephyr: test: userspace: add pipeline_two_components test

Add a new test to userspace_ll set that tests more of the functionality
needed to run full audio pipelines in user-space. The test creates a pipeline
with two components (IPC4 host and DAI copiers), does pipeline
prepare, one copy cycle in prepared state and tears down the pipeline.

One user-space thread is created to manage the pipelines. This would
be equivalent to user IPC handler thread. Another user-space thread
is created for the LL scheduler.

Signed-off-by: Kai Vehmanen <[email protected]>

Author: kv2019i