virtio: video: reject resources with more than one entry
virtio: video: reject resources with more than one entry

The crosvm video device cannot currently work with resources that have
more than one memory/object entry. Enforce this rule at the command
level.

BUG=b:161774071
BUG=b:169295147
TEST=Android Youtube plays properly on Hatch.

Cq-Depend: chromium:3247491
Cq-Depend: chromium:3247492
Change-Id: Ibfe2e420b4a77062cca940c5e97e7053aa4b76a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3026345
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Commit-Queue: Alexandre Courbot <301cd6a3ea50a894b4b51e385c5eb12b9a4ffc0c@chromium.org>
Reviewed-by: Keiichi Watanabe <815e4e8f7c92a23424d7c3f51ead622bcedbc720@chromium.org>

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