Base: use another Method to Kill app (NavRing Target)

sometimes SystemUi got Killed if enable NavRing Kill app
or using long press back button

this code fix that

taken from SlimRoms
https://github.com/SlimRoms/frameworks_base/commit/bbbb6f6fb2b1db59825b6a32ae136c72cac52bfa

Change-Id: If60b04105e77977df42ef32a91aeb7e5ea393531
SystemUI: Cleanup and enhance notification drawer header

- Crop properly images on tablets and landscale
- Use a separate layer instead of breaking header background
- Fix bug where you couldn't turn header back on after turning it off
- Added a gradient overlay

Change-Id: Ife399b82a3f272fb2ecc8e738c5f274f7682a556
Merge "Base: use another Method to Kill app (NavRing Target)" into android-4.4
Merge remote-tracking branch 'omni/android-4.4' into android-4.4