Add code to read Intel microcode from CBFS

When CONFIG_MICROCODE_IN_CBFS is enabled, find the microcode blob in
CBFS and pass it to intel_update_microcode() instead of using the
compiled in array.

CBFS accesses in pre-RAM and 'normal' environments are provided
through different API.

Change-Id: I35c1480edf87e550a7b88c4aadf079cf3ff86b5d
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/1296
Tested-by: build bot (Jenkins)

src/include/cpu/intel/microcode.h

@@ -1,6 +1,7 @@
 /*
  * This file is part of the coreboot project.
  *
+ * Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.
  * Copyright (C) 2000 Ronald G. Minnich
  *
  * This program is free software; you can redistribute it and/or modify
@@ -16,7 +17,15 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
+#ifndef __CPU__INTEL__MICROCODE__
+#define __CPU__INTEL__MICROCODE__
 
-#if !defined(__ROMCC__)
+#ifndef __PRE_RAM__
+#if CONFIG_MICROCODE_IN_CBFS
+void intel_update_microcode_from_cbfs(void);
+#else
 void intel_update_microcode(const void *microcode_updates);
 #endif
+#endif
+
+#endif