thermal/drivers/cpuidle_cooling: Delete unmatched comments

The function no longer returns a value, synchronize the comments.

Signed-off-by:  <wangchenggang@vivo.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1681789108-28130-1-git-send-email-wangchenggang@vivo.com