MountService: Add support for multiple storage configurations

Currently AOSP only supports a single storage configuration that is hardcoded
in storage_list.xml. Some device updates are now merging data and internal
storage partitions, and as a result require the storage list to support two
different variations.

By utilizing the sys.storage_legacy property this will allow for the framework
to support multiple configurations which can be determined during boot.

Change-Id: Id795520425ea3e99a5234e10c978dcdbd68a1311
Revert "Base: Prevent lock/unlock sound during music playback"

This reverts commit bd55d90b8a54fe045bb7a9c8780689696711f967.

It got fixed properly in Iee5d02829da46f91a326c0fab3e60996af55a1f9

Change-Id: I54fca2b20935e2d7b27769838584cab7ac0da666
Merge remote-tracking branch 'omni/android-4.4' into android-4.4