vboot: add vbnv_flash as template

this adds a flash vbnv driver for vboot to store non-volatile data in a flash
storage.

BUG=chrome-os-partner:32774
BRANCH=none
TEST=Built samus, veyron pinky, and cosmos
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>

Original-Change-Id: If5fc1b779722528134ad283fa030f150b3bab55f
Original-Reviewed-on: https://chromium-review.googlesource.com/222258
Original-Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Original-Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
(cherry picked from commit 1916da67123680d379d8926380d797cf466b7994)

Change-Id: If5ff3542cc14139ec0b02cf5661c42a1b02da23e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8886
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
3 files changed