vaapi: treat cropped decoder output slightly more correctly

Work around that FFmpeg doesn't distinguish between surface and cropped
size. The decoder always aligns the surface size to something
"convenient" (e.g. 16 for h264), and to get to the correct cropped size,
the output image's width/height is reduced. Using the cropped size
instead of the real surface size breaks the libva API in certain cases,
so we simply store and use the original size in our per-surface struct.

(If data is cropped on the left/top borders, hw decoding will simply
display these - FFmpeg doesn't let us do better.)

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