intel/blorp: Add support for binding an actual stencil buffer

While we're here, we also make depth without HiZ work.

v2:
 - Use the correct surface type for 1-D on SKL+
 - Set QPitch on BDW+

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
2 files changed