Compatible Vulkan backends should now enable ETC2/ASTC but no functional
changes because no TextureFormat in ETC2 or ASTC have been added yet.
Bug: dawn:955
Change-Id: I56e8ff73f931a12253fe6d21f3f4b91e3459ef13
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/62701
Commit-Queue: Loko Kung <lokokung@google.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>