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
MountService:  Support for alternative LVM storage list configuration

To facilitate allowing a different storage_list to be used when LVM partition alteration
is detected on a device, add a new storage_list_lvm.xml - This will be chosen when the
property ro.lvm_storage is set to 1 or true

The init scripts will set this property when an alternate storage configuration is
detected.  If the property is not set, the system will simply use the standard
storage list configuration

Change-Id: I4c3b636afad8b3343df83d97c7febaafd5d22f25