[build] Add GN build rules for GPT utils Bug: b/262617680 Change-Id: I7b8252a2d3ba46143fa71a92097fab27ad1f9b05 Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/vboot_reference/+/787152 Reviewed-by: David Pursell <dpursell@google.com>