cpuidle: menu: Remove iowait influence

cpuidle: menu: Remove iowait influence

Remove CPU iowaiters influence on idle state selection.

Remove the menu notion of performance multiplier which increased with
the number of tasks that went to iowait sleep on this CPU and haven't
woken up yet.

Relying on iowait for cpuidle is problematic for a few reasons:

 1. There is no guarantee that an iowaiting task will wake up on the
    same CPU.

 2. The task being in iowait says nothing about the idle duration, we
    could be selecting shallower states for a long time.

 3. The task being in iowait doesn't always imply a performance hit
    with increased latency.

 4. If there is such a performance hit, the number of iowaiting tasks
    doesn't directly correlate.

 5. The definition of iowait altogether is vague at best, it is
    sprinkled across kernel code.

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Link: https://patch.msgid.link/20240905092645.2885200-2-christian.loehle@arm.com
[ rjw: Minor edits in the changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>