iio:dac:ad5592r: Move exports into IIO_AD5592R namespace

In order to avoid unnecessary pollution of the global symbol namespace
move the common/library functions into a specific namespace and import
that into the various specific device drivers that use them.

For more information see https://lwn.net/Articles/760045/

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Paul Cercueil <[email protected]>
Reviewed-by: Paul Cercueil <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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