Add PhoneAccountRegistration related CTS tests.

1. Third party apps cannot register a phone account with
CAPABILITY_SIM_SUBSCRIPTION (b/21644860)
2. Registered phone accounts are not enabled automatically.
3. Prevent 3rd party app from enabling its own phone account.
4. Enabled phone account shows up in
TelecomManager.getCallCapableAccounts

BUG: 20303674
Change-Id: I865e0bcd040297f4dd5595ac284246d9eec7f1fb
1 file changed