[2/3] Telephony: allow disabling non intrusive incall ui

Change-Id: I54c07211dc121117543ccb8a4799efa491e5a469

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

Conflicts:

	res/xml/call_feature_setting.xml
	src/com/android/phone/CallFeaturesSetting.java
Move Incoming Call in Background option

Change-Id: I4862bc6f1e0ef8ed276de74d22fb0dc8abd2131e