cosmetic: tweak params of hlr_controlif_setup()

Cosmetically prepare for adding new CTRL commands in hlr_controlif_setup():
- drop unused 'gs' param.
- use ctrl_interface_setup_dynip2(), so far with default CTRL nodes; custom
  nodes will be added soon.

Prepares: I98ee6a06b3aa6a67adb868e0b63b0e04eb42eb50
Change-Id: I63004a7953b04988449697dbc5d55d7ed0c6d82d
diff --git a/src/ctrl.h b/src/ctrl.h
index 663de30..239deea 100644
--- a/src/ctrl.h
+++ b/src/ctrl.h
@@ -27,5 +27,4 @@
 #include "gsup_server.h"
 
 int hlr_ctrl_cmds_install();
-struct ctrl_handle *hlr_controlif_setup(struct hlr *ctx,
-					struct osmo_gsup_server *gs);
+struct ctrl_handle *hlr_controlif_setup(struct hlr *hlr);