Change vulkan image memory allocation back to using sub allocation

Bug: skia:
Change-Id: I8e1352c8d615b5a54ceba42500f0781767a1bd2d
Reviewed-on: https://skia-review.googlesource.com/14401
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed