thermal: devfreq_cooling: Fix kernel-doc

Fix function name in devfreq_cooling.c comment to remove a
warning found by kernel-doc.

drivers/thermal/devfreq_cooling.c:479: warning: expecting prototype for
devfreq_cooling_em_register_power(). Prototype was for
devfreq_cooling_em_register() instead.
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NYang Li <yang.lee@linux.alibaba.com>
Reviewed-by: NNick Desaulniers <ndesaulniers@google.com>
Reviewed-by: NNathan Chancellor <nathan@kernel.org>
Reviewed-by: NLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1623223350-128104-1-git-send-email-yang.lee@linux.alibaba.com

drivers/thermal/devfreq_cooling.c

@@ -458,7 +458,7 @@ struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df)
 EXPORT_SYMBOL_GPL(devfreq_cooling_register);
 
 /**
- * devfreq_cooling_em_register_power() - Register devfreq cooling device with
+ * devfreq_cooling_em_register() - Register devfreq cooling device with
  *		power information and automatically register Energy Model (EM)
  * @df:		Pointer to devfreq device.
  * @dfc_power:	Pointer to devfreq_cooling_power.