iio: common: cros_ec_sensors: simplify timestamp channel definition

Use IIO_CHAN_SOFT_TIMESTAMP() to define the timestamp channel instead of
manually filling in the struct iio_chan_spec fields. This makes the code
less verbose and mistake-prone.

Also drop obvious comment while we're at it.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: dlech

drivers/iio/common/cros_ec_sensors/cros_ec_activity.c

@@ -279,13 +279,7 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
 		channel++;
 	}
 
-	/* Timestamp */
-	channel->scan_index = index;
-	channel->type = IIO_TIMESTAMP;
-	channel->channel = -1;
-	channel->scan_type.sign = 's';
-	channel->scan_type.realbits = 64;
-	channel->scan_type.storagebits = 64;
+	*channel = IIO_CHAN_SOFT_TIMESTAMP(index);
 
 	indio_dev->channels = st->channels;
 	indio_dev->num_channels = index + 1;

drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c

@@ -279,13 +279,7 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
 		}
 	}
 
-	/* Timestamp */
-	channel->type = IIO_TIMESTAMP;
-	channel->channel = -1;
-	channel->scan_index = CROS_EC_SENSOR_MAX_AXIS;
-	channel->scan_type.sign = 's';
-	channel->scan_type.realbits = 64;
-	channel->scan_type.storagebits = 64;
+	*channel = IIO_CHAN_SOFT_TIMESTAMP(CROS_EC_SENSOR_MAX_AXIS);
 
 	indio_dev->channels = state->channels;
 	indio_dev->num_channels = CROS_EC_SENSORS_MAX_CHANNELS;