iio: imu: smi330: remove redundant assignment in smi330_read_avail

iio: imu: smi330: remove redundant assignment in smi330_read_avail

In the IIO_CHAN_INFO_OVERSAMPLING_RATIO case, the type parameter
is assigned from smi330_average_attr.type and then immediately
overwritten with IIO_VAL_INT on the next line.

Since smi330_average_attr.type is already initialized to IIO_VAL_INT,
the second assignment is redundant. Remove the hardcoded assignment
to maintain consistency in the code.

Signed-off-by: Massimiliano Pellizzer <mpellizzer.dev@gmail.com>
Reviewed-by: Jianping Shen <Jianping.Shen@de.bosch.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>