Make @SystemApi happy with signature change.

Nobody was using this yet, and API council requested tweaks are
causing us to change the return type.

Test: atest android.util.RecurrenceRuleTest
Test: atest com.android.server.NetworkPolicyManagerServiceTest
Bug: 74945820
Change-Id: I6c6ddfdfb3838b8e2ae1bed1d5e15b2debd77ee0
1 file changed