tracing: Remove orphaned event_trace_printk

The event_trace_printk macro has no callers since commit
b8e6555 ("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>

Author: chenhengqi

include/linux/trace_events.h

@@ -859,24 +859,6 @@ int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
 int trace_set_clr_event(const char *system, const char *event, int set);
 int trace_array_set_clr_event(struct trace_array *tr, const char *system,
 		const char *event, bool enable);
-/*
- * The double __builtin_constant_p is because gcc will give us an error
- * if we try to allocate the static variable to fmt if it is not a
- * constant. Even with the outer if statement optimizing out.
- */
-#define event_trace_printk(ip, fmt, args...)				\
-do {									\
-	__trace_printk_check_format(fmt, ##args);			\
-	tracing_record_cmdline(current);				\
-	if (__builtin_constant_p(fmt)) {				\
-		static const char *trace_printk_fmt			\
-		  __section("__trace_printk_fmt") =			\
-			__builtin_constant_p(fmt) ? fmt : NULL;		\
-									\
-		__trace_bprintk(ip, trace_printk_fmt, ##args);		\
-	} else								\
-		__trace_printk(ip, fmt, ##args);			\
-} while (0)
 
 #ifdef CONFIG_PERF_EVENTS
 struct perf_event;