Currently the default behavior is to manually having the devfreq
backend to register themselves as a devfreq cooling device.

Instead of adding the code in the drivers for the thermal cooling
device registering, let's provide a flag in the devfreq's profile to
tell the common devfreq code to register the newly created devfreq as
a cooling device.
Suggested-by: NChanwoo Choi <cwchoi00@gmail.com>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: NSteven Price <steven.price@arm.com>
Reviewed-by: NLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>