BUG: rescan serial device if .tp_disable present and switching drivers
BUG: rescan serial device if .tp_disable present and switching drivers

BUG=chromium-os:19433
TEST=tested on device

Change-Id: I4852e2ce550740e4da5df4815b688cf15e30dbcf
Reviewed-on: http://gerrit.chromium.org/gerrit/6367
Tested-by: Andrew de los Reyes <7bd5f9be8af0e6bb22e5665635eff3a09edb828c@chromium.org>
Reviewed-by: Andrew de los Reyes <7bd5f9be8af0e6bb22e5665635eff3a09edb828c@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager