Move nehalem/sandy/ivy to per-device acpi

Change-Id: I3d664ab575bf9c49a7bff9a395fbab96748430d0
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6802
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)

src/drivers/intel/gma/i915.h

@@ -285,6 +285,7 @@ u32 gtt_read(u32 reg);
 int i915lightup(unsigned int physbase, unsigned int mmio,
 		unsigned int gfx, unsigned int init_fb);
 int panel_lightup(struct intel_dp *dp, unsigned int init_fb);
+void *igd_make_opregion(void);
 
 /* display.c */
 void compute_display_params(struct intel_dp *dp);