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As we are adding ImageProcessor support to the V4L2SVDA, quite a bit of
code is going to be similar to the one already present in V4L2VDA. In
order to limit code duplication, move the most obvious bits into a
helper class for VDA which both classes can use.

Bug: b:132589320
Test: vdaunittest and vdatests pass on Minnie.
Change-Id: I6b0594b705acfd8f112335c9a56b3c262a5bca78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731510
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685463}