i965: Drop the tiling argument to intel_miptree_create_for_bo.

i965: Drop the tiling argument to intel_miptree_create_for_bo.

The drm function to get the tiling is just a getter storing the two
pointers, so we don't need to go out of our way to avoid it.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>