dt-bindings: iio: adc: qcom,spmi-vadc: simplify compatible enum

The second compatible item in oneOf is just an enum, not a list.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221027143411.277980-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>