ivi-shell: remove add_configured_listener left-over

In all my rebases, this got accidentally left behind. The implementation
was removed in 4a7503976b5d300a4474b149d877cf579c2a8c05 but
32ca791df8f855898e007512f3b996a66ffcb09c reintroduced it.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/ivi-shell/ivi-layout-shell.h b/ivi-shell/ivi-layout-shell.h
index caa7ff1..3221a0a 100644
--- a/ivi-shell/ivi-layout-shell.h
+++ b/ivi-shell/ivi-layout-shell.h
@@ -54,10 +54,6 @@
 ivi_layout_init_with_compositor(struct weston_compositor *ec);
 
 void
-ivi_layout_surface_add_configured_listener(struct ivi_layout_surface *ivisurf,
-					   struct wl_listener *listener);
-
-void
 ivi_layout_surface_destroy(struct ivi_layout_surface *ivisurf);
 
 int