dt-bindings: auxdisplay: holtek: Add missing type for "linux,no-autorepeat"

"linux,no-autorepeat" is missing a type, add it.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230613201049.2824028-1-robh@kernel.org


Signed-off-by: Rob Herring <robh@kernel.org>