dt-bindings: clock: Add Google gs101 clock management unit bindings

Provide dt-schema documentation for Google gs101 SoC clock controller.
Currently this adds support for cmu_top, cmu_misc and cmu_apm.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231209233106.147416-3-peter.griffin@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>