iio: adc: qcom-pm8xxx-xoadc: drop unused kerneldoc struct pm8xxx_chan_info member

Drop description of non-existing 'struct pm8xxx_chan_info' member:

  qcom-pm8xxx-xoadc.c:386: warning: Excess struct member 'scale_fn_type' description in 'pm8xxx_chan_info'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240225202744.60500-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/qcom-pm8xxx-xoadc.c

@@ -372,7 +372,6 @@ static const struct xoadc_channel pm8921_xoadc_channels[] = {
  * @name: name of this channel
  * @hwchan: pointer to hardware channel information (muxing & scaling settings)
  * @calibration: whether to use absolute or ratiometric calibration
- * @scale_fn_type: scaling function type
  * @decimation: 0,1,2,3
  * @amux_ip_rsv: ratiometric scale value if using ratiometric
  * calibration: 0, 1, 2, 4, 5.