vboot: use vb2 verification functions for kernel verification

This removes old vboot1 functions in favor of the new vboot2 functions.

BUG=chromium:611535
BRANCH=none
TEST=make runtests; emerge-kevin coreboot depthcharge

Change-Id: Idc64f7714bbd9d4fa82d14b6b5d73d71c61de854
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/400900
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
12 files changed