Revert "use aosp status bar and navbar transparency without launcher3 dependancy"

This reverts commit 89fa9c0431fabb2ceae377f87b7e4be8e7dcbe56.

Change-Id: I4c2f05abef92751447cb928af7bf93c933665714
Frameworks: setting to enable/disable translucent decor (1/2)

using aosp code for enabling both lockscreen and home screen decor:
  - add default setting, overrideable in overlays
  - retain aosp config for functionality

Change-Id: I195ac6aedd86a4c15e2b3b328e19ec1c1050dbec