vboot2: Add prototype for hwcrypto RSA

Introduce new prototype for HW RSA accleration. This is not used
on anywhere yet but will unblock coreboot work to support HW RSA.

BRANCH=none
BUG=b:163710320, b:161205813
TEST=make runtests; emerge-zork coreboot depthcharge

Change-Id: Ic4b93f32410efdd06bd012efe58749b6ef0692c6
Signed-off-by: Kangheui Won <khwon@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2364338
Reviewed-by: Julius Werner <jwerner@chromium.org>
3 files changed