v4l2_stateful_encoder: Allow per hierarchical layer bitrate

There is a max of 6 hierarchical layers. Each layer can have a
specific bitrate.

BUG=b:350572907
TEST=v4l2_stateful_encoder ... -n "<num1>, <num2>"

Change-Id: Ib10df425b88d8e1eeb62866ed9509fd7cabb802a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/drm-tests/+/5791203
Reviewed-by: Steve Cho <[email protected]>
Tested-by: Fritz Koenig <[email protected]>
Commit-Queue: Fritz Koenig <[email protected]>
1 file changed