Split the signed AMDFW binaries into their own section and enable PSP
verstage.
BUG=b:284984667
TEST=Build Myst BIOS image with PSP Verstage. Boot to OS successfully
with PSP verstage and a separate section for signed AMDFW binaries.
Change-Id: Ie0a54c157ebdebf9a0c95933c96865e0782a0f90
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75703
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>