Mostly a consistency change where now the list never needs to be
prefixed with RendererVk:: and always prefixed with vk::.

Also we can respect the style guide's member ordering suggestion.

Bug: b/172704839
Change-Id: I758bf324573e5585be6842b3455feab0c23c9d4a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2525142Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>