update gpu_driver_versions.proto to support vgpu

Add the field supported_host_versions for each DriverVersion - this is a
list for the host gpu driver versions supported for this guest-vgpu
driver version.

BUG=b/423030998
TEST=Create fresh VM --> COS_GPU_INSTALLER=gcr.io/$PROJECT/cos-gpu-installer sudo -E cos-extensions install gpu --> verify installation.
RELEASE_NOTE=NONE

Change-Id: I9dcb8c426e80865b91dec158beeabd6cdc13da99
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/110642
Reviewed-by: Shuo Yang <gshuoy@google.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Miri Amarilio <mirilio@google.com>
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>