dt-bindings: clock: cs2000-cp: document cirrus,clock-skip flag

This mode allows the PLL to maintain lock even when CLK_IN has
missing pulses for up to 20 ms.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220125093336.226787-4-daniel@zonque.org


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