iio: adc: adi-axi: Move exported symbols into IIO_ADI_AXI namespace.

Avoid unnecessary pollution of the global symbol namespace by
moving library functions in to a specific namespace and import
that into the drivers that make use of the functions.

For more info: https://lwn.net/Articles/760045/

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

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