ASoC: SOF: Intel: Fix pipeline state transitions for aggregate DAIs

[ujfalusi]

For aggregate DAIs (num_cpus > 1) the pre_trigger/post_trigger callbacks
send pipeline state IPCs per-DAI without considering that multiple DAIs
may share the same pipeline. This causes premature state transitions
where the pipeline goes RUNNING before all link DMAs have started, or
individual DAIs send redundant IPCs for shared pipelines.

Fix this by checking the HDA stream running state in post_trigger:

• START/PAUSE_RELEASE: defer RUNNING IPC until all DAIs sharing the
  same pipeline have their link DMA streams running
• STOP/SUSPEND/PAUSE_PUSH: use pipeline state dedup so the PAUSED IPC
  is sent once regardless of how many DAIs share the pipeline

The running-state check naturally handles all aggregate topologies:
shared pipelines, independent pipelines, and mixed cases without
requiring per-pipeline counters.