tracing: Remove orphaned event_trace_printk

The event_trace_printk macro has no callers since commit
b8e65554 ("tracing: remove deprecated TRACE_FORMAT").
So drop it.

Link: https://lore.kernel.org/20250213113951.813258-1-hengqi.chen@gmail.com


Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>