arm64: defconfig: Enable devfreq cooling device

Devfreq cooling device framework is used in Panfrost
to throttle GPU in order to regulate its temperature.

Enable this driver for ARM64 SoC.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220906153034.153321-2-peron.clem@gmail.com