Vulkan: Fix redefining TexStorage after TexImage. This can be easily implemented via a release call. Bug: angleproject:2651 Change-Id: I0adb3ed385284c6342716cd7c347de9966a81bab Reviewed-on: https://chromium-review.googlesource.com/1200368 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>