thermal/drivers/cpu_cooling: Fixup the header and copyright

The copyright format does not conform to the format requested by
Linaro: https://wiki.linaro.org/Copyright



Fix it.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>