Frameworks: Policy: implement a pin keypad shuffler [1/2]

this is to further prevent people using the tablet guessing your pin based on fingerprints left on the screen
example of the expected outcome - https://www.dropbox.com/sh/r3xb2q53ksaqni9/Oz1Eu8Dm7O

- correct coding style
- added reload button

PatchSet:
- simplify shuffle code
- fix over shifting in some cases
- add reload button functionallity
- add lockscreenutils method to detect only PIN lock
  for settings
- exclude sim and simpuk PIN lock
- add drawables for reload button

PatchSet
- cleanup

PatchSet:
- fix shuffle NumKeyPad even if a theme replaces the xml
  and reload button is not present.

PatchSet:
- add mode disabled/always/on request

PatchSet:
- add nicer drawables

cheers

kufi

Ported to new keyguard package on LP

A bit rewrite of this feature + clean up and shorten aosp code

Conflicts:
	packages/Keyguard/res/layout/keyguard_pin_view.xml
	packages/Keyguard/src/com/android/keyguard/KeyguardPINView.java
	packages/Keyguard/src/com/android/keyguard/NumPadKey.java