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/include/cbmem.h

@@ -46,6 +46,7 @@
 #define CBMEM_ID_ACPI		0x41435049
 #define CBMEM_ID_ACPI_GNVS	0x474e5653
 #define CBMEM_ID_ACPI_GNVS_PTR	0x474e5650
+#define CBMEM_ID_IGD_OPREGION	0x4f444749
 #define CBMEM_ID_CBTABLE	0x43425442
 #define CBMEM_ID_PIRQ		0x49525154
 #define CBMEM_ID_MPTABLE	0x534d5054