tracing: Rename ftrace_output functions to trace_output

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The ftrace_output_*() and ftrace_raw_output_*()
functions represent the trace_event code. Rename them to just trace_output
or trace_raw_output.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/trace/perf.h b/include/trace/perf.h
index b1d7399..0dbdbfe 100644
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -58,7 +58,7 @@
  * }
  *
  * static struct trace_event ftrace_event_type_<call> = {
- *	.trace			= ftrace_raw_output_<call>, <-- stage 2
+ *	.trace			= trace_raw_output_<call>, <-- stage 2
  * };
  *
  * static char print_fmt_<call>[] = <TP_printk>;