Use actual storage type of sdcard/usb (1/2).

TODO: Provide drawable for usb storage (someone please).

Conflicts:

	core/res/res/values/cm_strings.xml
	core/res/res/values/symbols.xml
	packages/SystemUI/src/com/android/systemui/usb/StorageNotification.java

Change-Id: Icaf0d246ab3bdd0614c8bb7a22f8b2b95cbe9c7e