frameworks: base: Port password retention feature

Port password retention feature for HW FDE.

This patch also include these changes:
   - Fix clearing of retained password
   - keyguard: Fix password doesnot sanitize after verification
   - LockSettings: fix the get password issue during boot up
   - frameworks/base: Fix pattern update issue

Change-Id: I2def56b14c10229b72feccd1c97b281cad65f282