optional encryption password sync

Option to use 2 different tokens for encryption and locking.
Allows convenient usage and strong encryption at the same time.

Inspired by reading next:
https://santoku-linux.com/howto/mobile-forensics/how-to-brute-force-android-encryption

Related discussion:
http://code.google.com/p/android/issues/detail?id=29468

Change-Id: I87f12bb1644f3abcbbd6b23813bbbf2cd58855df

Conflicts:
	services/java/com/android/server/LockSettingsService.java
Increasing ring volume

Change-Id: Ie78f4db7c2e9db4a0464158f85374fcdfd1067b3
Signed-off-by: Petr Reznicek <kecinzer@gmail.com>