vboot2: Add nvstorage and secdata functions

This is the second of several CLs adding a more memory- and
code-efficient firmware verification library.

BUG=chromium:370082
BRANCH=none
TEST=make clean && COV=1 make

Change-Id: I1dd571e7511bff18469707d5a2e90068e68e0d6f
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/199841
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
16 files changed