cpu/intel: apply microcode updates 20180312 to currently tracked models

This updates Intel's microcode updates for the CPU models we currently
track to the latest release. These include meltdown/spectre mitigations.
Source: https://downloadcenter.intel.com/download/27591

Applying the scripts results in changes to the models with CPU ID 206ax,
306ax, 306cx and 4065x. I tested this on a Thinkpad X230 (model 306ax).
The revision is then 1f instead of 1b; (dmesg|grep microcode); loaded
by coreboot (not Linux).

Change-Id: Idf5aa85681391707822bbfe493cff269ff2b88eb
Tested-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Martin Kepplinger <martink@posteo.de>

Author: merge

cpu/intel/microcode/update-microcodes.sh

@@ -18,10 +18,10 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 #
 
-MICROCODE_VERSION=20150121
+MICROCODE_VERSION=20180312
 MICROCODE_ARCHIVE=microcode-$MICROCODE_VERSION.tgz
 MICROCODE_FILE=microcode.dat
-INTEL_MICROCODE=http://downloadmirror.intel.com/24661/eng/$MICROCODE_ARCHIVE
+INTEL_MICROCODE=http://downloadmirror.intel.com/27591/eng/$MICROCODE_ARCHIVE
 
 #
 # Getting Intel(R) Microcode

cpu/intel/model_206ax/microcode-m12206a7_00000029.h

@@ -1,2 +1,2 @@
 
-#include "microcode-m12206a7_00000029.h"
+#include "microcode-m12206a7_0000002d.h"

cpu/intel/model_206ax/microcode-m12206a7_0000002d.h

@@ -1,2 +1,2 @@
 
-#include "microcode-m12306a9_0000001b.h"
+#include "microcode-m12306a9_0000001f.h"