i965: Fix border color on Sandybridge and Ivybridge.

i965: Fix border color on Sandybridge and Ivybridge.

While reading through the simulator, I found some interesting code that
looks like it checks the sampler default color pointer against the bound
set in STATE_BASE_ADDRESS.  On failure, it appears to program it to the
base address itself.

So I decided to try programming a legitimate bound, and lo and behold,
border color worked.

+92 piglits on Sandybridge.  Also fixes Lightsmark on Ivybridge.

NOTE: This is a candidate for stable release branches.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=28924
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38868
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>