The patch introduces the skeleton code from the AAF plugin as well as
the buildsystem bits in order to get the plugin built. Following the
approach from other plugins, the AAF plugin is only built if its
dependency (libavtp) is detected by configure.
Follow-up patches implement support for both playback and capture modes.
Signed-off-by: Andre Guedes <andre.guedes@intel.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz>