iio: chemical: sps30: Move symbol exports into IIO_SPS30 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: Tomasz Duszynski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-By: Joe Simmons-Talbott <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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