agp/intel: fix cache control for sandybridge

This is broken from 97ef1bdd0bc75bce7b2058e9c432b6c277dcf4d3.
Let's set the correct bit for LLC+MLC and LLC only.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed