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In the V4L2SVD, the allocation of bitstream ids was performed in the
client thread by a method and member counter. Move this into a
dedicated internal class that keeps things localized and ensures
thread-safety. This also makes it easier to split the stateless part of
the V4L2SVD into a separate backend.

Bug: 1003223
Test: video_decode_accelerator_tests passing on Kevin.

Change-Id: I507dc48ac3d2b016e569b6c8d288fe6e7bced78e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840033
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703207}