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The video_decode_accelerator_unittest is deprecated in favor of the
video_decode_accelerator_tests and video_decode_accelerator_perf_tests.
This CL removes all documentation related to the old tests.

vdatest_usage.md documents both the VEA and VDA tests. It has been renamed to
veatest_usage.md and all parts referring to the VDA tests have been removed.

TEST=None

BUG=1802897

Change-Id: I754c039238e553493bc4076b160ab6928e97a4c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800853
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709791}