thermal: samsung: core: Exynos TMU rework to use device tree for configuration

This patch brings support for providing configuration via device tree.
Previously this data has been hardcoded in the exynos_tmu_data.c file.
Such approach was not scalable and very often required copying the whole
data.

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