Allow LockPatternUtils usage on non-looper threads

Fixes an issue where LPU could no longer
be used on a non-looper thread even though
the looper is only used for a certain callback.

Now only using that callback mechanism is fatal
on a non-looper thread.

Change-Id: I2d766bd6c913e345ed6a3500b486263c8bc12b07
Fixes: 30076804