iio:light:st_uvis25: Move exports to IIO_UVIS25 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 bus specific device drivers that use them.

For more information see https://lwn.net/Articles/760045/Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220130205701.334592-16-jic23@kernel.org

drivers/iio/light/st_uvis25_core.c

@@ -323,7 +323,7 @@ int st_uvis25_probe(struct device *dev, int irq, struct regmap *regmap)
 
 	return devm_iio_device_register(dev, iio_dev);
 }
-EXPORT_SYMBOL(st_uvis25_probe);
+EXPORT_SYMBOL_NS(st_uvis25_probe, IIO_UVIS25);
 
 static int __maybe_unused st_uvis25_suspend(struct device *dev)
 {
@@ -349,7 +349,7 @@ static int __maybe_unused st_uvis25_resume(struct device *dev)
 const struct dev_pm_ops st_uvis25_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(st_uvis25_suspend, st_uvis25_resume)
 };
-EXPORT_SYMBOL(st_uvis25_pm_ops);
+EXPORT_SYMBOL_NS(st_uvis25_pm_ops, IIO_UVIS25);
 
 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
 MODULE_DESCRIPTION("STMicroelectronics uvis25 sensor driver");

drivers/iio/light/st_uvis25_i2c.c

@@ -66,3 +66,4 @@ module_i2c_driver(st_uvis25_driver);
 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
 MODULE_DESCRIPTION("STMicroelectronics uvis25 i2c driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_UVIS25);

drivers/iio/light/st_uvis25_spi.c

@@ -66,3 +66,4 @@ module_spi_driver(st_uvis25_driver);
 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
 MODULE_DESCRIPTION("STMicroelectronics uvis25 spi driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_UVIS25);