baytrail: Add microcode/punit release 31a

BUG=chrome-os-partner:23505
BRANCH=none
TEST=build and boot on rambi

Change-Id: I89c25142245cd268f755210784fd9d0c60dc5661
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/176305
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Aaron Durbin <adurbin@chromium.org>
Tested-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4955
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/soc/intel/baytrail/microcode/microcode_blob.c

@@ -1,3 +1,3 @@
 unsigned microcode[] = {
-#include "M0C3067_00000319.h"
+#include "M0C3067_0000031A.h"
 };