sandybridge: Pass chip info to i915lightup.

Change-Id: I280441aadb0575dc0b99584cdcd48cc76a0289a2
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/5284
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>