dt-bindings: clk: sprd: add mipi_csi_xx clocks for SC9863A

mipi_csi_xx clocks are used by camera sensors.
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/20200527053638.31439-3-zhang.lyra@gmail.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/sprd,sc9863a-clk.yaml

@@ -28,6 +28,7 @@ properties:
       - sprd,sc9863a-rpll
       - sprd,sc9863a-dpll
       - sprd,sc9863a-mm-gate
+      - sprd,sc9863a-mm-clk
       - sprd,sc9863a-apapb-gate
 
   clocks: