Remove static initializer restriction for Vulkan tests

Change-Id: I277110976844fc80271f4e86bb8474047e8abd2a
Reviewed-on: https://skia-review.googlesource.com/20510
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
4 files changed