Tests for SubscriptionManager APIs.

Ensure that new SubscriptionManager APIs behave as documented.  Test
based on device claiming FEATURE_TELEPHONY, and require that we have
a valid getDefaultDataSubscriptionId() to run our tests against.

Test: atest android.telephony.cts.SubscriptionManagerTest
Bug: 77327990, 71816837
Change-Id: Ib90ceeacf546c9b36ecf69694442cb661a62d353
3 files changed