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 <daniel@zonque.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220125093336.226787-5-daniel@zonque.org


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