thermal/core: Correct function name thermal_zone_device_unregister()

thermal/core: Correct function name thermal_zone_device_unregister()

[ Upstream commit a052b5118f13febac1bd901fe0b7a807b9d6b51c ]

Fix the following make W=1 kernel build warning:

  drivers/thermal/thermal_core.c:1376: warning: expecting prototype for thermal_device_unregister(). Prototype was for thermal_zone_device_unregister() instead

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210517051020.3463536-1-yangyingliang@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>