dt-bindings: serial: 8250: Fix 'aspeed,lpc-io-reg' differing types

The 'aspeed,lpc-io-reg' property is also defined in
ipmi/aspeed,ast2400-kcs-bmc.yaml as a 'uint32-array'. Unify it to use
'uint32-array' everywhere.
Signed-off-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230125221513.3059177-1-robh@kernel.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/8250.yaml

@@ -200,7 +200,8 @@ properties:
     deprecated: true
 
   aspeed,lpc-io-reg:
-    $ref: '/schemas/types.yaml#/definitions/uint32'
+    $ref: '/schemas/types.yaml#/definitions/uint32-array'
+    maxItems: 1
     description: |
       The VUART LPC address.  Only applicable to aspeed,ast2500-vuart.