gve: Add gve-1.0.1 source.

Put the driver source of v1.0.1 in COS kernel tree to remove the
dependency of building 'gve' as an out of tree module.

BUG=b:148952665
SOURCE=GVNIC

Change-Id: I02633c7cb54da5b4bb0eca1d118e784a815d8851
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/lakitu-kernel/+/2071636
Commit-Queue: Roy Yang <royyang@google.com>
Tested-by: Roy Yang <royyang@google.com>
Reviewed-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
Reviewed-by: Roy Yang <royyang@google.com>