[infra] Use int for internal_hardware_label

Bug: skia:
Change-Id: I86c4160e0c65c9f8459087e34eaf39907a76c9da
Reviewed-on: https://skia-review.googlesource.com/47182
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed