anv: Fix stencil layout in render passes

We incorrectly utilize the stencil layouts structures even if we should stick to the depth_stencil ones if the layout includes stencil.

Fixes: c1c346f1 ("anv: implement VK_KHR_separate_depth_stencil_layouts") Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Closes: #4084 (closed)