Revert "[1/2] base: support separate encryption/lockscreen passwords"

This reverts commit 9d37d587.

Separated encryption password implementation is currently not so well implemented
and it exposes some additional security issues

Change-Id: I290491d6db445785aa750ac35b06e6524659af9f
Signed-off-by: Joey Rizzoli <joey@lineageos.org>