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

Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml

@@ -40,6 +40,7 @@ properties:
   linux,keymap: true
 
   linux,no-autorepeat:
+    type: boolean
     description: Disable keyrepeat
 
   default-brightness-level: