VbNvStorage: Add flags for misc settings

1. Change offset 8 to hold all misc settings (fastboot, boot_on_ac
detect) instead of only fastboot settings.
2. Add flag to hold state of boot_on_ac_detect (If set to 1, AP should
start booting as soon as AC is connected in off-state).

BUG=chrome-os-partner:41680
BRANCH=None
TEST=Compiles successfully. make runtests successful.

Change-Id: I64b3fc69bd52cbcaf5899c953ccafa2e81b5b8a5
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/289900
Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
8 files changed