InCallUI: Add "Answer Via Speakerphone" Glowpad Target

Change-Id: If8bdb14f1df386272c9b16816175322ecda2fa90

Conflicts:
	res/values/cm_strings.xml
	src/com/android/incallui/GlowPadWrapper.java
Fix adding speakerphone target to answer screen
Speakerphone target fixes