Hover: exclude from insecure lockscreen (1/2)

Enable/disable hover notifications from insecure lockscreen

Change-Id: I9235d8dac32359dff692f6f9c821c715fefe9cde

Conflicts:
	core/java/android/provider/Settings.java
Hover master switch (1/2)

This commit remove hover button from status bar expanded and add a new option into hover settings allowing the user to enable or disable it using a checkbox

Conflicts:
	packages/SystemUI/res/layout/status_bar_expanded_header.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java