Implement multi-SIM capabilities (1/6) [DO NOT MERGE]

- Split PhoneAccount into PhoneAccount & PhoneAccountMetadata
- Move PhoneAccount methods from TelephonyManager to TelecommManager

Bug:16292368
Change-Id: Ib440368d6bd0572b63c942360450fde5c27d84b9
(cherry picked from commit 936b3552b4a3569be9904c826b95b632886fb45d)

telecomm/java/android/telecomm/RemoteConnectionService.java

@@ -266,10 +266,7 @@ final class RemoteConnectionService implements DeathRecipient {
                 mComponentName,
                 null /* id */,
                 null /* handle */,
-                "" /* label */,
-                "" /* shortDescription */,
-                true /* isEnabled */,
-                false /* isSystemDefault */));
+                0 /* capabilities */));
         return accounts;
     }