dt-bindings: serial: xlnx,opb-uartlite: Drop 'contains' from 'xlnx,use-parity'

'contains' applies to arrays, but 'xlnx,use-parity' is a scalar. So drop
'contains' from the 'if' schema.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221111212838.4103828-1-robh@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.yaml

@@ -67,7 +67,6 @@ allOf:
   - if:
       properties:
         xlnx,use-parity:
-          contains:
           const: 1
     then:
       required: