x86/traceponit: Fix comment about irq vector tracepoints

Commit:

  4b9a8dca ("x86/idt: Remove the tracing IDT completely")

removed the 'tracing IDT' from arch/x86/kernel/tracepoint.c,
but left related comment. So that the comment become anachronistic.
Just remove the comment.

Link: https://lkml.kernel.org/r/20220526110831.175743-1-sunliming@kylinos.cnSigned-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

arch/x86/kernel/tracepoint.c

 // SPDX-License-Identifier: GPL-2.0
 /*
- * Code for supporting irq vector tracepoints.
- *
  * Copyright (C) 2013 Seiji Aguchi <seiji.aguchi@hds.com>
- *
  */
 #include <linux/jump_label.h>
 #include <linux/atomic.h>