Add label for persist.pm.mock-upgrade

This property is used for testing purposes when verifying the
behavior when an OTA occurs. It should be readable by the
system server, and be settable by the shell.

Test: Set property from shell, read with PackageManager
Bug: 140992644
Change-Id: I39ad9b7961208f02fa45011215c2ff5ac03b7380
5 files changed