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: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230125221513.3059177-1-robh@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>