Change in coreboot[master]: amd/picasso/psp_verstage: add vboot rsa function

[Kangheui Won (Code Review)]

Hello build bot (Jenkins), Furquan Shaikh, Martin Roth, Julius Werner, Aaron Durbin,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/44456

to look at the new patch set (#8).

Change subject: amd/picasso/psp_verstage: add vboot rsa function
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amd/picasso/psp_verstage: add vboot rsa function

Add vb2ex_hwcrypto_rsa_verify_digest function for verifying rsa
signature against digest using PSP svc.
This function will be later used by vboot to accelerate rsa
verification.

BUG=b:163710320, b:161205813
TEST=build zork firmware with vboot modification, confirm it's booting
and boot time is reduced

Change-Id: Ic5c1d13092db5a84191642444f3df9c26925e475
Signed-off-by: Kangheui Won 
---
M src/soc/amd/picasso/psp_verstage/svc.c
M src/soc/amd/picasso/psp_verstage/vboot_crypto.c
2 files changed, 54 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/44456/8