iio: proximity: sx_common: Drop documentation of non existent struct element.

struct sx_common_data doesn't have a num_default_regs element so
drop the documentation for it.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20230114172928.80414-1-jic23@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/proximity/sx_common.h

@@ -101,7 +101,6 @@ struct sx_common_chip_info {
  * @client:		I2C client structure.
  * @trig:		IIO trigger object.
  * @regmap:		Register map.
- * @num_default_regs:	Number of default registers to set at init.
  * @chan_prox_stat:	Last reading of the proximity status for each channel.
  *			We only send an event to user space when this changes.
  * @trigger_enabled:	True when the device trigger is enabled.