GitLab

This change is the first pass of restructuring
the exynos vda implementation to a more generic
v4l2 vda to facilitate support for other v4l2
based vda.

BUG=chromium-os-partner:24752
TEST=Run video playback, vda_unittest

Review URL: https://codereview.chromium.org/122233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243803 0039d316-1c4b-4281-b951-d872f2087c98