anv/pipeline: Store the (set, binding, index) tripple in the bind map

anv/pipeline: Store the (set, binding, index) tripple in the bind map

This way the the bind map (which we're caching) is mostly independent of
the pipeline layout.  The only coupling remaining is that we pull the array
size of a binding out of the layout.  However, that size is also specified
in the shader and should always match so it's not really coupled.  This
rendering issues in Dota 2.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit a1a25db69926604d579139d1d497f1566ec16ac7)