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

This reverts commit f1389d385b7df05b7f69d4b44a7059a933f1811f.
vold: Send UUID with list response

UUID defaults to 0 if not available

Change-Id: I59df514aeffa7d926a31d02589e6ff3031bde79e