dt-bindings: Document the hi3660 clock bindings

Add DT bindings documentation for hi3660 SoC clock.

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
1 file changed