Don't suppress haptic feedback on keyguard anymore.

This enables haptic feedback from virtual keys, lift-to-wake,
and long-press power to work as expected on the keyguard.

There doesn't seem to be a good reason for us to block haptic feedback
on keyguard anymore.  The PIN, pattern, and password locks already
bypass this check and vibrate and require a swipe to access in
the first place.  So there doesn't seem to be much potential
for accidental vibration anymore.

If this becomes a problem then we can investigate more targeted
means to suppress undesired vibration.

Added some debugging code to VibratorService.

Bug: 16535403
Change-Id: Ia7a5d8c35244009db36c358e5cbcbf8cf5d68768