sb/intel/common: Create a common PCH finalise implementation

The common finalise code is used by bd82x6x, Lynx Point, and Ibex Peak.

Lynx Point now benefits from being able to write-protect the flash chip.

For Lynx Point, writing the SPI OPMENU now happens in ramstage, as done
in bd82x6x.

Tested on an ASRock H81M-HDS (Lynx Point). When write-protection is
configured, flashrom reports all flash regions as read-only, and does
not manage to alter the contents of the flash chip.

Also tested on an ASUS P8H61-M LX (Cougar Point). Everything seems to
work as before.

Change-Id: I781082b1ed507b00815d1e85aec3e56ae5a4bef2
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/c/29977
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/southbridge/intel/lynxpoint/smihandler.c b/src/southbridge/intel/lynxpoint/smihandler.c
index 12e5ea2..a3965d0 100644
--- a/src/southbridge/intel/lynxpoint/smihandler.c
+++ b/src/southbridge/intel/lynxpoint/smihandler.c
@@ -25,8 +25,10 @@
 #include <elog.h>
 #include <halt.h>
 #include <pc80/mc146818rtc.h>
+#include <southbridge/intel/common/finalize.h>
 #include <northbridge/intel/haswell/haswell.h>
 #include <cpu/intel/haswell/haswell.h>
+#include "me.h"
 #include "pch.h"
 
 #include "nvs.h"
@@ -284,6 +286,7 @@
 			return;
 		}
 
+		intel_me_finalize_smm();
 		intel_pch_finalize_smm();
 		intel_northbridge_haswell_finalize_smm();
 		intel_cpu_haswell_finalize_smm();