'semtech,resolution' is a single value, not an array.

Note that it is also defined as a string in semtech,sx9310.yaml. Sigh.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230125221404.3057806-1-robh@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>