tracing: move print of event format to separate file

Impact: clean up

Move the macro that creates the event format file to a separate header.
This will allow the default ftrace events to use this same macro
to create the formats to read those events.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

diff --cc kernel/trace/trace_events_stage_2.h
Simple merge

diff --cc kernel/trace/trace_format.h
Simple merge