add lockscreen shortcuts PA style

Conflicts:
	core/res/res/drawable-xhdpi/ic_lockscreen_alarm.png
	core/res/res/layout/keyguard_selector_view.xml
	core/res/res/values/symbols.xml
	policy/src/com/android/internal/policy/impl/keyguard/KeyguardSelectorView.java

Change-Id: I4e2f1b821778b60bb4cc13b91ae6ed17b093c16d