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_main.cpp b/src/pcu_main.cpp
index fa075cd..21cb244 100644
--- a/src/pcu_main.cpp
+++ b/src/pcu_main.cpp
@@ -277,7 +277,7 @@
 	bssgp_set_log_ss(DBSSGP);
 
 	vty_init(&pcu_vty_info);
-	pcu_vty_init(&gprs_log_info);
+	pcu_vty_init();
 
 	handle_options(argc, argv);
 	if ((!!spoof_mcc) + (!!spoof_mnc) == 1) {