Phone: Add a controller for proximity sensor

Add the setting for enable proximity sensor or not when calling

ps2: Enable via overlay

Change-Id: I42bc05ae1c22443cca782ac1ae66d5d5bb4ac858

Conflicts:
	res/values-zh-rCN/cm_strings.xml
	res/values/config.xml
	res/values/slim_strings.xml
	res/xml/call_feature_setting.xml
	res/xml/msim_call_feature_setting.xml
	src/com/android/phone/CallFeaturesSetting.java
	src/com/android/phone/MSimCallFeaturesSetting.java