linux: reorder video devices after gpu
linux: reorder video devices after gpu

Create the virtio video-decoder and video-encoder devices after the GPU
device so that the device number of GPU will be consistent on ARCVM
platforms where video devices may or may not exist.

BUG=b:178348623
TEST=boot arcvm on betty and hatch, check gpu pci id is equal

Change-Id: I99d9d0befe6e5aea16fc4e85ed527e4954010466
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2773655
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Commit-Queue: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>

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