Input: goodix - provide some missing function parameter descriptions

Fixes the following W=1 kernel build warning(s):

 drivers/input/touchscreen/goodix.c:569: warning: Function parameter or member 'len' not described in 'goodix_check_cfg'
 drivers/input/touchscreen/goodix.c:587: warning: Function parameter or member 'len' not described in 'goodix_send_cfg'
 drivers/input/touchscreen/goodix.c:1165: warning: Function parameter or member 'cfg' not described in 'goodix_config_cb'
 drivers/input/touchscreen/goodix.c:1165: warning: Function parameter or member 'ctx' not described in 'goodix_config_cb'
 drivers/input/touchscreen/goodix.c:1165: warning: Excess function parameter 'ts' description in 'goodix_config_cb'
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201112110204.2083435-5-lee.jones@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/goodix.c

@@ -564,6 +564,7 @@ static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts)
  *
  * @ts: goodix_ts_data pointer
  * @cfg: firmware config data
+ * @len: config data length
  */
 static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
 {
@@ -582,6 +583,7 @@ static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
  *
  * @ts: goodix_ts_data pointer
  * @cfg: config firmware to write to device
+ * @len: config data length
  */
 static int goodix_send_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len)
 {
@@ -1156,6 +1158,7 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
 /**
  * goodix_config_cb - Callback to finish device init
  *
+ * @cfg: firmware config
  * @ts: our goodix_ts_data pointer
  *
  * request_firmware_wait callback that finishes