vboot: Use 2nvstorage instead of vboot_nvstorage

Remove the old vboot1 vboot_nvstorage library (VbNv*() functions) and
use the vboot2 library (vb2_nv_*()) instead.  This is needed in
preparation for moving to 64-byte records; no sense in implementing
that change twice...

Should be (better be) no change in system behavior.

TEST=make runtests
     compare output of crossystem before/after change (should be identical)

Change-Id: I10f9975b0824263064b9a74a3c6daadcecc085d3
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/794732
35 files changed