dt-bindings: clock: cs2000-cp: document cirrus,dynamic-mode

This new flag exists to enable the dynamic mode of the hardware.
When not given, the static mode is used.

Signed-off-by: Daniel Mack <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/cirrus,cs2000-cp.yaml

···
       has missing pulses for up to 20 ms.
     $ref: /schemas/types.yaml#/definitions/flag
 
+  cirrus,dynamic-mode:
+    description:
+      In dynamic mode, the CLK_IN input is used to drive the
+      digital PLL of the silicon.
+      If not given, the static mode shall be used to derive the
+      output signal directly from the REF_CLK input.
+    $ref: /schemas/types.yaml#/definitions/flag
+
 required:
   - compatible
   - reg