[2/2] Settings: NavigationBar Customization

Navigation Bar edit tutorial PNG

PS2: derp in display_settings.xml
PS3: NavBar.java Import DeviceUtils helper class and implement it for 'isPhone'
PS6: Add current lockscreen function to Utils.java
PS7-9: Utils: add device specific coding

Change-Id: Ic413e209c1185b19dea6484d8388908beee5a7ed

Conflicts:
	res/values/pa_strings.xml
	res/xml/display_settings.xml
	src/com/android/settings/Utils.java