(6) Port "Option to hide Adb notification icon (2/2)"

Change-Id: I63bfb7e4b4f0ac4d4d4c3da68ea767e8a37babdd
(7) Framework: Forward port Long press back to kill app

Original author: DaneshM

Patchset 2-3
- rebased

Change-Id: I54f4fb861897fe713cffa15422535c5091a0c095

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/symbols.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java