v3dv/meta_copy: handle mirroring z component bliting 3D images

By basing the tex_coord on the max layer, instead of min (similarly to
what we do for mirroring x/y)

Avoid all crashes, and get to Pass most of the following tests:
   dEQP-VK.api.copy_and_blit.core.blit_image.simple_tests.mirror_z_3d.*

The only one failing is this one:
   dEQP-VK.api.copy_and_blit.core.blit_image.simple_tests.mirror_z_3d.nearest

but looks that the core cause would be different, as there are other
3d nearests tests failing.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
1 file changed