Rename backgroundStartPrivileges parameter.

This parameter is used only for the specific case where the
PendingIntent's sender forcably allows background activity starts.
This exemption is only granted to persistent system processes.

Test: atest BackgroundActivityLaunchTest
Bug: 306059525
Change-Id: Iecf3a4cce9f437904b154edf9a9c455225f3c565
5 files changed