iio: adc: ad9467: add new chip_info variables

Add new variables to the per chip info structure:

* test_points: Number of valid test points for calibration;
* has_dco_invert: Supports inverting DCO (Data clock output) polarity;
* dco_en: Specicic mask to enable DCO delays.

This is in preparation for supporting new parts with subtle differences
in how to configure the hardware.

Note that with the new test_points variable, we also add a new
calib_map_size to 'struct ad9467_state' so we know our map size
depending on how many test points we have and if we can run the
calibration in the inverted state or not.

Signed-off-by: Nuno Sa <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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