Revert incorrect interpretation of the write protect switch status.
Revert incorrect interpretation of the write protect switch status.

When reading the firmware write protect switch status, 0 means
'not protected', 1 means 'protected'.

BUG=chromium-os:15800
TEST=manual

Change-Id: I82a875570707d0c088a8b92c1ebc51d22ba43bde
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/1986
Reviewed-by: Chris Masone <98e3d65c6b0e9e2391eb4c2e8b1e572b77e544ed@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/1993

joshfire/chromiumos-platform-login_manager,joshfire/chromiumos-platform-login_manager,joshfire/chromiumos-platform-login_manager