Revert "Fix copy offset when uploading initial mip data in Vulkan"

Revert "Fix copy offset when uploading initial mip data in Vulkan"

This reverts commit f6c360f7ce738411ba2d97f188e30aef0504dfc7.

Reason for revert: breaking write tests.
Original change's description:
> Fix copy offset when uploading initial mip data in Vulkan
>
> BUG=skia:
>
> Change-Id: Id25e5f39d1393b8dec325d85afb4bc22a11f6bda
> Reviewed-on: https://skia-review.googlesource.com/10283
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Jim Van Verth <jvanverth@google.com>
>

TBR=egdaniel@google.com,jvanverth@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Change-Id: If7f9eccc7f1ba923393a14c5e11678610986faa6
Reviewed-on: https://skia-review.googlesource.com/10286
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>