This is needed for non-volatile register emulation. Also, this can be
used to implement system jump or reset flags.
BUG=chrome-os-partner:19235
TEST=Run utils test. Check persistent storage file exists.
BRANCH=None
Change-Id: I699f95718ef6f5de6c3bbb4e37619ee015fb6c4a
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50313
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>