add STREAM_FM
Add fm volume control

Change-Id: I8b3a10e3037c5bb3c7c044b86ddf9de5045d3e9d

Conflicts:
	core/res/res/values/config.xml
	core/res/res/values/strings.xml
	core/res/res/values/symbols.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
disable fm separate volume control by default