All the idle routines are called with RCU disabled, as such there must
not be any tracing inside.

While there; clean-up the io-port idle thing.
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Tested-by: NTony Lindgren <tony@atomide.com>
Tested-by: NUlf Hansson <ulf.hansson@linaro.org>
Acked-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: NFrederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195540.251666856@infradead.org