Add getSelfManagedPhoneAccounts TelecomManager API.

Adding getSelfManagedPhoneAccounts TelecomManager API; this is consistent
with the getCallCapablePhoneAccounts API which is already present.

Test: CTS
Bug: 34159263
Merged-In: I542ac26f71b680ee61c680a5f4c184a462f2a339
Change-Id: I542ac26f71b680ee61c680a5f4c184a462f2a339
(cherry picked from commit 66ab9ae7926a4976d375d1e38b97cddbc91e0303)
2 files changed