mb/google/skyrim: Update signed PSP verstage binaries

Since the last time PSP verstage has been signed, there are some FMAP
updates to cache VBIOS tables and improve boot time. There is also an
FMAP update to cache the memory training data in recovery mode. These
FMAP updates are incompatible with previously signed PSP verstage. Also
couple more designs got added and they need their dose of signed PSP
verstage.

Here are the PSP Verstage details:
* FW: 15371.0.0
* PSP: 00.3C.01.18
* Coreboot SHA: cffd7abd5994e53808eae57340c0ce4374c1546c

BUG=b:269788636, b:271589757
TEST=System boots to OS in skyrim. Perform suspend/resume test. Run some
FAFT tests to ensure they are passing.

Change-Id: Id0e076608156059d3f9818cedfb343815aa257a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/blobs/+/4278061
Commit-Queue: Jonathon Murphy <jpmurphy@google.com>
Auto-Submit: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-by: Jonathon Murphy <jpmurphy@google.com>
Tested-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
5 files changed