dt-bindings: clock: sprd,sc9860-clk: convert to YAML

Convert the Spreadtrum SC9860 clock bindings to DT schema.

Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Link: https://lore.kernel.org/r/ZobghvwZAyMjl4eB@standask-GA-A55M-S2HP


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>