nb/intel/sandybridge/peg: Add PEG driver stub

Required for other ACPI generators, like the one used for _ROM.

* Add ACPI code for PEG10/PEG11/PEG12/PEG60 and include it on all platforms.
* Add PCIe driver for PEG. The driver returns ACPI names for ssdt generators.

Needs test on real hardware.

Change-Id: I96835c43522580c95fd4f250c56bf9438e993bc1
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/22337
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/sandybridge/acpi/sandybridge.asl b/src/northbridge/intel/sandybridge/acpi/sandybridge.asl
index 609106f..3076a68 100644
--- a/src/northbridge/intel/sandybridge/acpi/sandybridge.asl
+++ b/src/northbridge/intel/sandybridge/acpi/sandybridge.asl
@@ -2,6 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2017-2018 Patrick Rudolph <siro@das-labor.org>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -16,6 +17,7 @@
 
 #include "../sandybridge.h"
 #include "hostbridge.asl"
+#include "peg.asl"
 
 /* PCI Device Resource Consumption */
 Device (PDRC)