anv: Set STATE_BASE_ADDRESS upper bounds on gen7

This should fix floating-point border color on all gen7 HW.  Integer is
still thoroughly busted on gen7 because it doesn't exist on IVB and it's
crazy on HSW.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit 9672b704)