[Bug 765435] plugins: rework dmabuf import

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765435

--- Comment #14 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 328815
  --> https://bugzilla.gnome.org/attachment.cgi?id=328815&action=edit
pluginbase negotiates allocator with bufferpool

Originally vaapivideobufferpool instantiates its own allocator regardless the
received configuration, and it relies in custom configuration options to
choose which kind of allocator instantiate.

This patch transfers the responsibility of the allocator instantiate to
vaapipluginbase and pass it to the vaapivideobufferpool through its
configuration.

* gst/vaapi/gstvaapipluginbase.c
  + set_dmabuf_allocator(): inserts a dmabuf allocator in the bufferpool
  + ensure_sinkpad_buffer_pool(): set a normal vaapi video allocator in
    bufferpool configuration
  + gst_vaapi_plugin_base_propose_allocation(): call set_dmabuf_allocator() if
    needed.
  + gst_vaapi_plugin_base_decide_allocation(): set a normal vaapi video
    allocator in bufferpool configuration
* gst/vaapi/gstvaapivideobufferpool.c
  + gst_vaapi_video_buffer_pool_set_config(): instead of instantiate the
    allocator, process the received one through its configuration.
* gst/vaapi/gstvaapivideobufferpool.h: removed
  GST_BUFFER_POOL_OPTION_DMABUF_MEMORY since it is not used anymore.
* gst/vaapi/gstvaapivideomemory.c
  + gst_vaapi_is_dmabuf_allocator(): new helper function to identify a dmabuf
    allocator with the vaapi qdata.

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