Revert "Phone: Sprint MWI Quirk: Phantom message wait indicator workaround (1/2)"

This reverts commit b667f699a6917af407bba05425fa6a414e31365f.

Conflicts:

	res/values/config.xml
	res/values/strings.xml
	res/xml/call_feature_setting.xml
	src/com/android/phone/CallFeaturesSetting.java
	src/com/android/phone/CallNotifier.java