Phone: Add Missed call and Voicemail specific  notification lights

This commit adds the ability to use the configured missed call and voicemail
light settings

Requires Part 1 (Settings) and Part 2 (framework) commits

Change-Id: I70659f8948a2ff78d80df94f8a4a1af34f059e16

Conflicts:
	src/com/android/phone/NotificationMgr.java