The actual VkImage needs to have rotated extents, but the ImageHelper
needs to have non-rotated extents in order for the rest of ANGLE's
pre-rotation to work.

Bug: b/175793022
Change-Id: I6fa25ab8c636886787ac50b194e566111308f30b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2666514Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>