clk: sprd: Add dt-bindings include file for UMS512

This file defines all UMS512 clock indexes, it should be included in the
device tree in which there's device using the clocks.

Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220505101433.1575096-4-gengcixi@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>