cpuidle: governors: teo: Refine tick_intercepts vs total events check

cpuidle: governors: teo: Refine tick_intercepts vs total events check

Use 2/3 as the proportion coefficient in the check comparing
cpu_data->tick_intercepts with cpu_data->total because it is close
enough to the current one (5/8) and it allows of more straightforward
interpretation (on average, intercepts within the tick period length
are twice as frequent as other events).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Christian Loehle <christian.loehle@arm.com>
Link: https://patch.msgid.link/10793374.nUPlyArG6x@rafael.j.wysocki