anv: Stop forcing bindless for images

This was an unintended artifact of my testing of bindless images.  We
should be choosing bindless or not dynamically.

Fixes: c0d9926d "anv: Use bindless handles for images"
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
(cherry picked from commit 8413fd13)