Revert "Add UUID (re-)scan support for vold-mounted volume (2/2)"

This reverts commit 4251a271f6c2180155d9442f0ead1d37ffdbe034.

Change-Id: If82f8717831b141abcf64b5802fbd248e03fec51
vold: Send UUID with list response

UUID defaults to 0 if not available

Change-Id: I59df514aeffa7d926a31d02589e6ff3031bde79e