iio: dac: ad3530r: Add support for AD3532R/AD3532

The AD3532R/AD3532 is a 16-channel, 16-bit voltage output DAC. It shares
similar functionality with AD3530R but splits its registers into two
banks: bank 0 at 0x10xx for channels 0-7 and bank 1 at 0x30xx for
channels 8-15. The input, LDAC trigger and operating-mode registers are
therefore selected per bank.

Add the AD3532R register map, channel specs, per-bank register arrays, a
dedicated powerdown handler and its own regmap_config, reusing the
table-driven helpers for the shared configuration steps.

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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