message: Fix for coverity issues 171128, 171127, 171125
  Removed const iterator since the permissions it is compared to is not a const object.
diff: @@ -576,11 +576,11 @@ void FillNotificationData::UpdateParameters(
  void FillNotificationData::ExcludeSame(RpcPermissions& rpc) {
  HMIPermissions& rpc_hmi_permissions = rpc.hmi_permissions;
  - HMIPermissions::const_iterator it_hmi_allowed =
  + HMIPermissions::iterator it_hmi_allowed =
  rpc.hmi_permissions.find(kAllowedKey);
  - HMIPermissions::const_iterator it_hmi_undefined =
  + HMIPermissions::iterator it_hmi_undefined =
  rpc.hmi_permissions.find(kUndefinedKey);
  - HMIPermissions::const_iterator it_hmi_user_disallowed =
  + HMIPermissions::iterator it_hmi_user_disallowed =
  rpc.hmi_permissions.find(kUserDisallowedKey);
  // There is different logic of processing RPCs with and w/o 'parameters'
  