[Bug 796493] add support for GBM allocator

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796493

--- Comment #2 from Randy Li (ayaka) <ayaka at soulik.info> ---
The GBM is not the GL/EGL texture, I think an additional upload path is still
necessary. Another reason is that I am confused with the allocator in libgstgl.

I have not update the author information yet, you would found this allocator is
just modified from kms allocator :P

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