Fix vapi errors due to ipc_net_regist rename.

Without that fix we have many errors such as this one:
  mediators_network.c: In function 'samsung_network_get_status_real_run_co':
  mediators_network.c:1473:21: error: dereferencing pointer to incomplete type

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>

vapi/samsung-ipc-1.0.vapi

@@ -527,7 +527,7 @@ namespace SamsungIpc
             GPRS,
         }
 
-        [CCode (cname = "struct ipc_net_regist", destroy_function = "")]
+        [CCode (cname = "struct ipc_net_regist_response", destroy_function = "")]
         public struct RegistrationMessage
         {
             public AccessTechnology act;