Remove phone number from the "new" CallStateListener.

When the legacy PhoneStateListener was migrated to the new
TelephonyCallback class, the onCallStateChanged listener was copied over
as is.  This CL removes the phone number parameter from the new listener.
Under the hood, both the old PhoneStateListener and the new one use the
same IPhoneStateListener.aidl file, so the onCallStateChanged method for
the legacy listener is changed to onLegacyCallStateListener.

Test: See CTS test CL; added a bunch of CTS tests for this.
Fixes: 165831812
Change-Id: Ia67968b5235954b606c6bd2890cc6f46c468e041