turnip: Fix image size for 3D vkGetImageSubresourceLayout.

Fixes most subcases of dEQP-VK.image.subresource_layout.3d.* The remaining
failures appear to be in snorm, which 2D also fails on (and the blob
reports as not supported for this test).

We don't currently have these tests in CI, but they'll appear with
1.2.4.0.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7467>
1 file changed