dts: Documentation: Add documentation for Exynos7 SoC thermal bindings

Add documentation for exynos7 thermal bindings including compatible
name and special clock properties.

Acked-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
1 file changed