xtensa: fix xtensa_pmu_setup prototype

xtensa: fix xtensa_pmu_setup prototype

commit 6d65d3769d1910379e1cfa61ebf387efc6bfb22c upstream.

Fix the following build error in configurations with
CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS=y:

  arch/xtensa/kernel/perf_event.c:420:29: error: passing argument 3 of
  ‘cpuhp_setup_state’ from incompatible pointer type

Cc: stable@vger.kernel.org
Fixes: 25a77b55e74c ("xtensa/perf: Convert the hotplug notifier to state machine callbacks")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>