Generate SHA256/SHA384 hash of the signed firmware so that PSP verstage can pass it to PSP. The PSP will use these hashes to verify the integrity of those signed firmwares. BUG=b:203597980 TEST=Build Skyrim BIOS image. Change-Id: I50d278536ba1eac754eb8a39c4c2e428a2371c44 Signed-off-by: Kangheui Won <khwon@chromium.org> Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/60290 Reviewed-by: Jon Murphy <jpmurphy@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>