anv/nir: Rework arguments to apply_pipeline_layout

Instead of taking a whole pipeline (which could be anything!), just take
a physical device and robust_buffer_access boolean.  This makes it
easier to verify that only the things in the hash actually affect
pipeline compilation.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
(cherry picked from commit a24654b4)