iio: imu: smi330: Convert to common field_{get,prep}() helpers

Drop the driver-specific smi330_field_get() and smi330_field_prep()
macros, in favor of the globally available variants from
<linux/bit

iio: imu: smi330: Convert to common field_{get,prep}() helpers

Drop the driver-specific smi330_field_get() and smi330_field_prep()
macros, in favor of the globally available variants from
<linux/bitfield.h>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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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
ove

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>

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