Fix for framework reboot on format of SD card

MountService is not aware of /storage/emulated/legacy path which is
causing the issue on ExternalStorageFormatter service. We are getting
the a list of non-emulated SD cards and format the first one

Conflicts:
	core/java/android/os/storage/StorageManager.java
	core/res/res/values/symbols.xml

Change-Id: Iba1a9f6e40499f7f6fb095a5ee4e711b02bed439
CRs-fixed: 489037