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/tests/emu/pcu_emu.cpp b/tests/emu/pcu_emu.cpp
index e0190bf..7ecabe1 100644
--- a/tests/emu/pcu_emu.cpp
+++ b/tests/emu/pcu_emu.cpp
@@ -121,7 +121,7 @@
 	}
 
 	vty_init(&pcu_vty_info);
-	pcu_vty_init(&gprs_log_info);
+	pcu_vty_init();
 
 	current_test = 0;