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New V4L2 stateless video decoders depend on the request API in order to
submit jobs to the decoder. Requests are created from the media device
associated to a V4L2 decoder, so said devices need to be accessible by
the GPU process.

Whitelist /dev/media-dec* devices so that requests can be created and
stateless decoders used.

Bug:917279
Bug:b:123551776
Test: video decoding working on Kukui.

Change-Id: Ib98d890fb663399d610c0e99b1e4e96a6405c600
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763272
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689236}