cpuidle: teo: Avoid stopping the tick unnecessarily when bailing out

cpuidle: teo: Avoid stopping the tick unnecessarily when bailing out

When teo_select() is going to return early in some special cases, make
it avoid stopping the tick if the idle state to be returned is shallow.

In particular, never stop the tick if state 0 is to be returned.

Link: https://lore.kernel.org/linux-pm/CAJZ5v0jJxHj65r2HXBTd3wfbZtsg=_StzwO1kA5STDnaPe_dWA@mail.gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-and-tested-by: Kajetan Puchalski <kajetan.puchalski@arm.com>