dt-bindings: clock: Add bindings definitions for Exynos850 CMU

dt-bindings: clock: Add bindings definitions for Exynos850 CMU

Clock controller driver is designed to have separate instances for each
particular CMU. So clock IDs in this bindings header also start from 1
for each CMU.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211008154352.19519-4-semen.protsenko@linaro.org
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>