thermal: exynos: Modify exynos thermal code to use device tree for cpu cooling configuration

Up till now exynos_tmu_data.c was used for storing CPU cooling configuration
data. Now the Exynos thermal core code uses device tree to get this data.
For this purpose generic thermal code for configuring CPU cooling was
used.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>