ipa: ipu3: Implement an empty stop() function

While the stop() function does not currently perform any action, it forms
part of the IPA interface and is a public function in the class.

Promote it to a full (but basic) function implementation and begin the
documentation accordingly so that there is an appropriate stub to
perform stop operations if they come up.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

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