Enable virtual versions >= 4

In some cases we may need to have virtual versions >= 4, such as if
there is a board which inherits another board overlay. This adjusts
the pre-upload script to allow for these.

TEST=Try uploading a CL with a virtual that is version 4.

Change-Id: I289b2c85430cf134050dfea6d0ca4f2f190600d2
Reviewed-on: https://chromium-review.googlesource.com/321724
Commit-Ready: Bernie Thompson <bhthompson@chromium.org>
Tested-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2 files changed