anv: Make anv_image_aspect_to_plane take an anv_image*

anv: Make anv_image_aspect_to_plane take an anv_image*

It's called anv_image_* so it really should take an anv_image.  For the
couple of cases where we really want to pass in a set of aspects, we
leave an anv_aspect_to_plane() helper.  anv_image_aspect_to_plane() is
then just a wrapper around it which grabs the aspects from the image.

While we're in the area, sprinkle some const around.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12141>