iris: Only upload surface state for grid info when needed

iris: Only upload surface state for grid info when needed

Special care is needed to ensure that when we have two consecutive
calls with the same grid size, we only bail in the second one if it
either don't need the surface state or the surface state was already
uploaded.

v2: Instead of having a new bool in ice->state to know whether we had
    a surface, check whether we have state->ref.  (Ken)
    Clean up the logic a little bit by adding 'grid_updated' local. (Ken)

Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com> [v1]
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>