dt-bindings: clock: Add bindings for Exynos850 CMU_APM

CMU_APM generates clocks for APM IP-core (Active Power Management). In
particular it generates RTC clocks, which are needed to enable rtc-s3c
driver on Exynos850 SoC.

Add clock indices and binding documentation for CMU_APM.

Signed-off-by: Sam Protsenko <[email protected]>
Signed-off-by: Sylwester Nawrocki <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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