dt-bindings: iio: adc: samsung,exynos-adc: Use correct IRQ level in example

dt-bindings: iio: adc: samsung,exynos-adc: Use correct IRQ level in example

The interrupt line to GIC is IRQ_TYPE_LEVEL_HIGH, so use that instead of
"none".  Also replace the hard-coded GIC_SPI flag.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250724111345.47889-7-krzysztof.kozlowski@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>