Input: resistive-adc-touch - describe parameters in kernel doc

Validation script is not happy:

 resistive-adc-touch.c:53: warning: Function parameter or member 'x_plate_ohms' not described in 'grts_state'
 resistive-adc-touch.c:53: warning: Function parameter or member 'ch' not described in 'grts_state'

Describe parameters in kernel doc to make it happy.

Fixes: fb082cd5 ("Input: resistive-adc-touch - add support for z1 and z2 channels")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210528151113.85943-1-andriy.shevchenko@linux.intel.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/resistive-adc-touch.c

@@ -35,16 +35,18 @@ enum grts_ch_type {
 
 /**
  * struct grts_state - generic resistive touch screen information struct
+ * @x_plate_ohms:	resistance of the X plate
  * @pressure_min:	number representing the minimum for the pressure
  * @pressure:		are we getting pressure info or not
  * @iio_chans:		list of channels acquired
  * @iio_cb:		iio_callback buffer for the data
  * @input:		the input device structure that we register
  * @prop:		touchscreen properties struct
+ * @ch:			channels that are defined for the touchscreen
  */
 struct grts_state {
-	u32				pressure_min;
 	u32				x_plate_ohms;
+	u32				pressure_min;
 	bool				pressure;
 	struct iio_channel		*iio_chans;
 	struct iio_cb_buffer		*iio_cb;