timers: x86/mce: Use __init_timer() for resetting timers

DEBUG_OBJECTS_TIMERS is now checking if a timer is ever enqueued, and if
so, it must call del_timer_shutdown() before freeing, otherwise
debug objects will trigger. This requires that once a timer is initialized
(and initialized for debug objects) it must not be re-initialized using
timer_setup(), as that will call the debug objects initialization code
again and trigger a bug if it was ever used.

As the mce reinitializes its timers on CPU hotplug, it must use
__init_timer() instead of timer_setup(), which will only initialize the
debug objects once.

Link: https://lore.kernel.org/all/20220407161745.7d6754b3@gandalf.local.home/

Cc: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-edac@vger.kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>