crossystem: provide a way to clear wipeout request

For test purposes it should be possible to clear the wipeout request
raised by firmware.

BRANCH=none
BUG=chrome-os-partner:36059
TEST=verified that crossystem wipeout_request=0 changes the bit from 1
     to 0, and wipeout_request=1 does not change it from 0 to 1.

Change-Id: Ic45ec03ed3e40e6fee4244804b8c231ee88af95b
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/262466
Reviewed-by: Randall Spangler <rspangler@chromium.org>
(cherry picked from commit 52ec0758968d779e3bbacfa0ac988af0624fb274)
Reviewed-on: https://chromium-review.googlesource.com/270005
Reviewed-by: Patrick Sosinski <sosinski@google.com>
Commit-Queue: Patrick Sosinski <sosinski@google.com>
Tested-by: Patrick Sosinski <sosinski@google.com>
3 files changed