Fix intent used in PendingIntents

Need to have unique action name for each RollbackId to receive correct
callbacks from rollbackCommit API.
Need to set flag RECEIVER_REGISTERED_ONLY to receive broadcast before
system is ready

Test: verified that unique broadcast is received for each rollback
Bug: 289203818
Flag: android.crashrecovery.flags.refactor_crashrecovery
Change-Id: I0c8ec52aa02044cd5c4381e370ce807565a34899