dt-bindings: clock: samsung: convert Exynos5260 to dtschema

Convert Samsung Exynos5260 SoC clock controller bindings to DT schema
format.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Stephen Boyd <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: krzk