Remove unregister interface in telephony-maemo6

g_dbus_unregister_interface is removed from maemo6 telephony driver.
Interface com.nokia.MaemoTelephony is not used as result of changes
in csd back-end. CreateWith was replaced by Create and CreateFromLast
method calls, and set last number is implemented directly in csd.

Registration of this interface was removed due to these changes.
diff --git a/audio/telephony-maemo6.c b/audio/telephony-maemo6.c
index ff851f3..55f6a30 100644
--- a/audio/telephony-maemo6.c
+++ b/audio/telephony-maemo6.c
@@ -66,10 +66,6 @@
 	NETWORK_REG_STATUS_UNKOWN
 };
 
-/* Driver definitions */
-#define TELEPHONY_MAEMO_PATH		"/com/nokia/MaemoTelephony"
-#define TELEPHONY_MAEMO_INTERFACE	"com.nokia.MaemoTelephony"
-
 /* CSD CALL plugin D-Bus definitions */
 #define CSD_CALL_BUS_NAME	"com.nokia.csd.Call"
 #define CSD_CALL_INTERFACE	"com.nokia.csd.Call"
@@ -1923,9 +1919,6 @@
 	g_slist_free(watches);
 	watches = NULL;
 
-	g_dbus_unregister_interface(connection, TELEPHONY_MAEMO_PATH,
-						TELEPHONY_MAEMO_INTERFACE);
-
 	dbus_connection_unref(connection);
 	connection = NULL;