Robert Bragg 669b3ad864 pipeline: notify all progends of changes
When a pipeline is notified of a change we now make sure to notify all
progends of that change not just the progend directly associated with
that pipeline. A pipeline can have private state associated with it from
multiple progends because descendants will always try and cache state on
ancestors to maximize the chance that the state can later be re-used.
Descendants may be using different progends than the ancestors that they
cache state with.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 873939a18934185fb3c9c84c373cb86d1278add7)
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