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.c b/src/pcu_vty.c
index 3a733ef..1e4f50c 100644
--- a/src/pcu_vty.c
+++ b/src/pcu_vty.c
@@ -1147,7 +1147,7 @@
 	.is_config_node	= pcu_vty_is_config_node,
 };
 
-int pcu_vty_init(const struct log_info *cat)
+int pcu_vty_init(void)
 {
 //	install_element_ve(&show_pcu_cmd);
 
@@ -1164,8 +1164,8 @@
 						NO_STR "GSMTAP Category\n",
 						"\n", "", 0);
 
-	logging_vty_add_cmds(cat);
-	osmo_stats_vty_add_cmds(cat);
+	logging_vty_add_cmds();
+	osmo_stats_vty_add_cmds();
 
 	install_node(&pcu_node, config_write_pcu);
 	install_element(CONFIG_NODE, &cfg_pcu_cmd);