Set tklock if devicelock gets applied immediately after unblanking

If device is suspended, device lock might get applied at unblank time.
This in turn can leave the previously used application visible and
usable.

While the ideal solution would be to use iphb timer for locking the
device, using heuristics at least denies full access to application
content if delayed device locking happens.

[mce] Set tklock if devicelock gets applied immediately after unblanking