Do not enable JobParameters cleaner for SYSTEM_UID

JobParameters objects are passed by reference in local Binder
transactions for clients running as SYSTEM. The life cycle of the
JobParameters objects are no longer controlled by the client. Without
this change the cleaner may get invoked in the same context as JobScheduler causing unintended behavior.

Bug: 349688611
Bug: 369488147
Flag: EXEMPT bugfix

Change-Id: Ib9f1a8ea45fc8c7508a3aa2e2c99e10ea374e89a