intel: Temporarily disable HiZ for textures

intel: Temporarily disable HiZ for textures

A great refactor thrashing begins after this commit for HiZ and separate
stencil.  Removing code for texture HiZ will make that refactoring easier,
because then we don't have to maintain that code during the refactor.

To disable HiZ for textures, I've removed the hook in
intel_update_wrapper() that allocates a HiZ buffer when attaching a depth
texture to a framebuffer.

HiZ was broken for textures anyway, so there's no regression here.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>