device: virtio: video: Add dead_code attribute to SetControl
device: virtio: video: Add dead_code attribute to SetControl

BUG=b:161774071
TEST=None

Change-Id: Ia9c9ba1a316a409c17ac601e94bd3f6a75b24af5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2355847
Tested-by: Alex Lau <2a11013bf51aa920114d6ba04a98511931cd3184@chromium.org>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Keiichi Watanabe <815e4e8f7c92a23424d7c3f51ead622bcedbc720@chromium.org>
Reviewed-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-by: Alexandre Courbot <301cd6a3ea50a894b4b51e385c5eb12b9a4ffc0c@chromium.org>
Commit-Queue: Keiichi Watanabe <815e4e8f7c92a23424d7c3f51ead622bcedbc720@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm