Backport of !4437 (merged) "v4l2: videodec: Rework dynamic resolution change handling".
Commits:
- 1ca7f694 v4l2: videodec: Ensure object is inactive on failure
- 52b916bd v4l2: videodec: Move the capture setup into the processing loop
- 457dd19a v4l2: object: Fix bogus debug objects pointers
- 5c820862 v4l2: object: Move the GstPoll into v4l2object
- 66849fbd v4l2: videodec: Wait for source change event
- 4dded209 v4l2: bufferpool: Don't assert when orphaning is not needed
- fca61fad v4l2: videodec: Only warn of incomplete drain on success
- 4a53beeb v4l2: videodec: Improve few logs
- f58d5dfd v4l2: videodec: Remove the spurious srccaps probe
- c6be3d75 v4l2: videodec: Don't forcibly drain on resolution changes
- c9841a53 v4l2: bufferpool: Don't copy buffer when flushing
- 00492234 v4l2: videodec: Detect flushes while setting up the capture
- 51fa6a26 v4l2: pool: Flush events on capture queue