ITTI: remove useless log_scheduler() function

The primary motivation here is to remove a VLA, as in the parent
commits.  Closer inspection revealed that (1) it is only used by the LTE
UE, and (2) it only logs some data which we likely don't need. So I
simply removed this function.

common/utils/ocp_itti/intertask_interface.h

@@ -566,7 +566,6 @@ int timer_remove(long timer_id);
 int signal_handle(int *end);
 int signal_mask(void);
 
-void log_scheduler(const char *label);
 #ifdef __cplusplus
 }
 #endif