iio: adc: ad4080: remove unused dec_rate field
Remove unused dec_rate field from ad4080_state struct.
The driver reads/writes decimation rate directly from
hardware registers via ad4080_get_dec_rate() and
ad4080_set_dec_rate() functions.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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