crossystem: arm: use proper gpio references

BUG=none
TEST=make sure developer switch and recovery switch runtime reading works as expected (manually)

Change-Id: I3b17ac66f88b2b789bebe4e7d271666f8c63a8b0
Reviewed-on: http://gerrit.chromium.org/gerrit/4127
Reviewed-by: Olof Johansson <olofj@chromium.org>
Tested-by: Olof Johansson <olofj@chromium.org>
1 file changed