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The V4L2 stateful API requires the caller pass the same buffers to the
output queue slot. This CL change V4L2Queue::GetFreeBuffer() signature
that allows the caller get a specific output queue slot.

BUG=b:159688625
TEST=video.DecodeAccel.h264 passes on Kukui.

Change-Id: I5245998b236dbb698df3d1ca11b6f269dd5de374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413943
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812556}