mb/google/skyrim: Update signed PSP verstage binaries

PSP verstage update includes boot time improvements, reporting HSP
secure state and reporting previous boot state failures.
Here are the details of the signed PSP verstage:
* FW: 15345.0.0
* PSP: 00.3C.04.16 & 00.3C.01.17
* Coreboot SHA: 893aa7790305da9c68a5ad678eb64ba6692561e7

BUG=b:268552202
TEST=Build and boot to OS in Skyrim. Ensure that the PSP is operating in
Production mode with the signed PSP verstage.

Change-Id: Ifc78e413f9aaf0f77a49c6fdb52ab92bde8018f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/blobs/+/4241133
Commit-Queue: Tim Van Patten <timvp@google.com>
Tested-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Auto-Submit: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
diff --git a/mainboard/google/skyrim/frostflow_psp_verstage.signed.bin b/mainboard/google/skyrim/frostflow_psp_verstage.signed.bin
index c5b02f1..cd17456 100644
--- a/mainboard/google/skyrim/frostflow_psp_verstage.signed.bin
+++ b/mainboard/google/skyrim/frostflow_psp_verstage.signed.bin
Binary files differ
diff --git a/mainboard/google/skyrim/skyrim_psp_verstage.signed.bin b/mainboard/google/skyrim/skyrim_psp_verstage.signed.bin
index c99b6da..ae1fe1c 100644
--- a/mainboard/google/skyrim/skyrim_psp_verstage.signed.bin
+++ b/mainboard/google/skyrim/skyrim_psp_verstage.signed.bin
Binary files differ
diff --git a/mainboard/google/skyrim/winterhold_psp_verstage.signed.bin b/mainboard/google/skyrim/winterhold_psp_verstage.signed.bin
index dbbbeb6..3adce1e 100644
--- a/mainboard/google/skyrim/winterhold_psp_verstage.signed.bin
+++ b/mainboard/google/skyrim/winterhold_psp_verstage.signed.bin
Binary files differ