[Bug 790752] msdk: supports bufferpool

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790752

--- Comment #58 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 368112
  --> https://bugzilla.gnome.org/attachment.cgi?id=368112&action=edit
msdk: adds frame allocator using libva

Implements msdk frame allocator which is required from the driver.
Also makes these functions global so that GstMsdkAllocator could use 
the allocated video memory later and couple with GstMsdkMemory.

GstMsdkContext keeps allocation information such as mfxFrameAllocRequest
and mfxFrameAllocResponse after allocation.

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