dzn: Fix copies of block-based formats

dzn: Fix copies of block-based formats

D3D12 wants Width, Height and Depth to be aligned on the block width,
height and depth size. But Vulkan allows the width, height or depth to
be unaligned at the image boundary if image.{width,height,depth} is
not aligned.

Let's explicitly align things in the copy paths.

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17250>