Policy: Lockscreen Targets Unlock speed update

Fixes lag on the classic lockscreen targets and sets up a broadcast
receiver to use those methods from outside of policy like navring
example this commit and the future AOKP Ribbon.

Change-Id: Ia0735aa26a4cd1a2c95d0860992837daf5cacf6d

Conflicts:
	policy/src/com/android/internal/policy/impl/keyguard/KeyguardSelectorView.java
Lockscreen targets: more unification

Don't hardcode pixel sizes, and use a shared method to derive drawable
inset.

Change-Id: I2adf9230c5aa8efadddd713c435b37af24e23115

Conflicts:
	core/java/com/android/internal/util/cm/LockscreenTargetUtils.java
	policy/src/com/android/internal/policy/impl/keyguard/KeyguardSelectorView.java