Remove undefined param passed to {logging,osmo_stats}_vty_add_cmds

Since March 15th 2017, libosmocore API logging_vty_add_cmds() had its
parameter removed (c65c5b4ea075ef6cef11fff9442ae0b15c1d6af7). However,
definition in C file doesn't contain "(void)", which means number of
parameters is undefined and thus compiler doesn't complain. Let's remove
parameters from all callers before enforcing "(void)" on it.
API osmo_stats_vty_add_cmds never had a param list but has seem problem
(no "void"), so some users decided to pass a parameter to it.

Related: OS#4138
Change-Id: Ic1ac815eafab49577ff883a5d700ecca5936d216
diff --git a/src/pcu_vty.h b/src/pcu_vty.h
index a075350..2097561 100644
--- a/src/pcu_vty.h
+++ b/src/pcu_vty.h
@@ -12,7 +12,7 @@
 int pcu_vty_go_parent(struct vty *vty);
 int pcu_vty_is_config_node(struct vty *vty, int node);
 
-int pcu_vty_init(const struct log_info *cat);
+int pcu_vty_init();
 
 extern struct vty_app_info pcu_vty_info;