tracing: Rename ftrace_define_fields_##call() to trace_event_define_fields_##call()

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The function ftrace_define_fields_##call()
is used to define how to process the trace_event fields. It has nothing to
do with function tracing. Rename it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/trace/perf.h b/include/trace/perf.h
index c9af076..4ad2749 100644
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -65,7 +65,7 @@
  *
  * static struct trace_event_class __used event_class_<template> = {
  *	.system			= "<system>",
- *	.define_fields		= ftrace_define_fields_<call>,
+ *	.define_fields		= trace_event_define_fields_<call>,
  *	.fields			= LIST_HEAD_INIT(event_class_##call.fields),
  *	.raw_init		= trace_event_raw_init,
  *	.probe			= trace_event_raw_event_##call,
@@ -215,7 +215,7 @@
 static char print_fmt_##call[] = print;					\
 static struct trace_event_class __used __refdata event_class_##call = { \
 	.system			= TRACE_SYSTEM_STRING,			\
-	.define_fields		= ftrace_define_fields_##call,		\
+	.define_fields		= trace_event_define_fields_##call,	\
 	.fields			= LIST_HEAD_INIT(event_class_##call.fields),\
 	.raw_init		= trace_event_raw_init,			\
 	.probe			= trace_event_raw_event_##call,		\