i965: Initial Ivybridge CC state setup.

i965: Initial Ivybridge CC state setup.

The state itself still seems to be the same; the only change is that
each part (CC, BLEND, DEPTH_STENCIL) can now be uploaded independently.
Thus, we still rely on the code in gen6_cc.c to set up the state.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>