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Our current VP9 accelerator uses a Chromium-only, non mainline ABI to
communicate with the kernel. As we are about to introduce the
upstream-based ABI, and the corresponding VP9 accelerator, rename our
older one to "legacy" following the model already followed for H.264 and
VP8.

BUG=b:161415741
TEST=Chromium builds for arm-generic.

Change-Id: I582814b5efc2f6d10c9fd7a7305593dc211a61d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423653Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810045}