tools/lib/thermal: Remove the thermal.h soft link when doing make clean

Run "make -C tools thermal" can create a soft link for thermal.h in
tools/include/uapi/linux.  Just rm it when make clean.

Signed-off-by: zhang jiao <zhangjiao2@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20240912045031.18426-1-zhangjiao2@cmss.chinamobile.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>