anv: implement VK_EXT_pipeline_creation_feedback

anv: implement VK_EXT_pipeline_creation_feedback

An extension reporting cache hit in the user supplied pipeline cache
as well as timing information for creating the pipelines & stages.

v2: Don't consider no cache for cache hits (Jason)
    Rework duration accumulation (Jason)

v3: Fold feedback creation writing into pipeline compile functions (Jason/Lionel)

v4: Get cache hit information from anv_device_search_for_kernel() (Jason)
    Only set cache hit from the whole pipeline if all stages also have that bit (Lionel)

v5: Always user_cache_hit in anv_device_search_for_kernel() (Jason)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>