Add PerformanceControl Quick Link in Settings

Change-Id: Ic884614a5e618baaed4c19558d7f9435e57d7599

Conflicts:
	res/drawable-hdpi/ic_settings_performance.png
	res/drawable-mdpi/ic_settings_performance.png
	res/drawable-xhdpi/ic_settings_performance.png
	res/values/strings.xml
	res/xml/settings_headers.xml
	src/com/android/settings/Settings.java