iio: exynos-adc: request second interupt only when touchscreen mode is used

iio: exynos-adc: request second interupt only when touchscreen mode is used

commit 865b080e3229102f160889328ce2e8e97aa65ea0 upstream.

Second interrupt is needed only when touchscreen mode is used, so don't
request it unconditionally. This removes the following annoying warning
during boot:

exynos-adc 14d10000.adc: error -ENXIO: IRQ index 1 not found

Fixes: 2bb8ad9b44c5 ("iio: exynos-adc: add experimental touchscreen support")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20231009101412.916922-1-m.szyprowski@samsung.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>