anv: Add a usage parameter to anv_layout_to_aux_usage

anv: Add a usage parameter to anv_layout_to_aux_usage

Most places we actually know the usage and can provide it.  There are
two exceptions to this:

 1. We pass 0 into get_blorp_surf_for_anv_image when we use
    ANV_IMAGE_LAYOUT_EXPLICIT_AUX because anv_layout_to_aux_usage is
    never actually called so it doesn't matter.

 2. We pass 0 into anv_layout_to_aux_usage in transition_color_buffer.
    However, the coming commits which will begin using the usage
    parameter only care about depth.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2605>