iio: adc: ad7944: always use 32-bit DMA word for offload #2634
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PR Description
The HDL team is trying to standardize on using always 32-bit DMA words for SPI offload. Add a new channel_offloads channel configuration to reflect this. Also, since we are adding a new channel configuration, we can move the sampling frequency attribute implementation to use IIO_CHAN_INFO_SAMP_FREQ.
PR Type
PR Checklist
Tested with AD7985.