staging:iio:adis16260: Add scale for the inclination channel

While the inclination channel claims to support reading the scale the driver did
not implement this, so trying to read the scale results in a -EINVAL. This patch
fixes it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/gyro/adis16260_core.c

@@ -241,6 +241,10 @@ static int adis16260_read_raw(struct iio_dev *indio_dev,
 				*val2 = IIO_DEGREE_TO_RAD(73260);
 			}
 			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_INCLI:
+			*val = 0;
+			*val2 = IIO_DEGREE_TO_RAD(36630);
+			return IIO_VAL_INT_PLUS_MICRO;
 		case IIO_VOLTAGE:
 			if (chan->channel == 0) {
 				*val = 1;