iio: hid-sensor-prox: Fix invalid read_raw for attention

The attention channel is a IIO_CHAN_INFO_PROCESSED, not a
IIO_CHAN_INFO_RAW.

Modify prox_read_raw() to support it.

Fixes: 596ef5c ("iio: hid-sensor-prox: Add support for more channels")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20241122-fix-processed-v2-1-b9f606d3b519@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: ribalda

drivers/iio/light/hid-sensor-prox.c

@@ -94,6 +94,7 @@ static int prox_read_raw(struct iio_dev *indio_dev,
 	*val2 = 0;
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
+	case IIO_CHAN_INFO_PROCESSED:
 		if (chan->scan_index >= prox_state->num_channels)
 			return -EINVAL;
 		address = prox_state->channel2usage[chan->scan_index];