clk: sprd: Add dt-bindings include file for SC9863A

This file defines all SC9863A clock indexes, it should be included in the
device tree in which there's device using the clocks.

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/20200304072730.9193-5-zhang.lyra@gmail.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>