InCallUI: add volume boost UI in call UI.

Add volume boost UI in calling screen to enable volume boost and volume
enhancement function during calling.

Conflicts:
	res/layout/primary_call_info.xml
	res/values-zh-rCN/strings.xml
	res/values/strings.xml
	src/com/android/incallui/CallCardFragment.java

Change-Id: Ic42d8a24602939038c60e6a1a2812a4125200c99