iio:adc:ad76060: Move exports into IIO_AD7606 namespace.

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

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

Signed-off-by: Jonathan Cameron <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/iio/adc/ad7606.c

···
 
 	return devm_iio_device_register(dev, indio_dev);
 }
-EXPORT_SYMBOL_GPL(ad7606_probe);
+EXPORT_SYMBOL_NS_GPL(ad7606_probe, IIO_AD7606);
 
 #ifdef CONFIG_PM_SLEEP
 
···
 }
 
 SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
-EXPORT_SYMBOL_GPL(ad7606_pm_ops);
+EXPORT_SYMBOL_NS_GPL(ad7606_pm_ops, IIO_AD7606);
 
 #endif
 

drivers/iio/adc/ad7606_par.c

···
 MODULE_AUTHOR("Michael Hennerich <[e-mail]>");
 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_AD7606);

drivers/iio/adc/ad7606_spi.c

···
 MODULE_AUTHOR("Michael Hennerich <[e-mail]>");
 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_AD7606);