dt-bindings: devfreq: Add documentation for the interconnect properties

Add documentation for new optional properties in the exynos bus nodes:
interconnects, #interconnect-cells, samsung,data-clock-ratio.
These properties allow to specify the SoC interconnect structure which
then allows the interconnect consumer devices to request specific
bandwidth requirements.

Acked-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
Tested-by: Chanwoo Choi <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Artur Świgoń <[email protected]>
Signed-off-by: Sylwester Nawrocki <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>

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