iio: dac: ad3552r: add model data structure

Add a "model data" structure to keep useful hardware-related
information as from datasheet, avoiding id-based conditional
choices later on.

Removed id-based checks and filled model-specific structures
with device specific features, In particular, num_hw_channels
is introduced to keep the number of hardware implemented
channels, since 1-channel versions of the DACs are added
in this same patchset.

Signed-off-by: Angelo Dureghello <[email protected]>
Reviewed-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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