Removes onWakeKey/Motion handling from keyguard since it's no longer used.
The legacy code was originally intended to have keyguard filter wake events
which is now done in PhoneWindowManager. Ultimately it just needs to call
PowerManager.wakeUp() since keyguard no longer filters these keys.
Change-Id: I5b8ef9b422abf850a85b57f21944e5eb09fbedc2
e51cf7aeb6