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 <Jonathan.Cameron@huawei.com>
Cc: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220220173701.502331-5-jic23@kernel.org

drivers/iio/adc/ad9467.c

@@ -474,3 +474,4 @@ module_spi_driver(ad9467_driver);
 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("Analog Devices AD9467 ADC driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_ADI_AXI);

drivers/iio/adc/adi-axi-adc.c

@@ -86,7 +86,7 @@ void *adi_axi_adc_conv_priv(struct adi_axi_adc_conv *conv)
 
 	return (char *)cl + ALIGN(sizeof(struct adi_axi_adc_client), IIO_ALIGN);
 }
-EXPORT_SYMBOL_GPL(adi_axi_adc_conv_priv);
+EXPORT_SYMBOL_NS_GPL(adi_axi_adc_conv_priv, IIO_ADI_AXI);
 
 static void adi_axi_adc_write(struct adi_axi_adc_state *st,
 			      unsigned int reg,
@@ -224,7 +224,7 @@ struct adi_axi_adc_conv *devm_adi_axi_adc_conv_register(struct device *dev,
 
 	return conv;
 }
-EXPORT_SYMBOL_GPL(devm_adi_axi_adc_conv_register);
+EXPORT_SYMBOL_NS_GPL(devm_adi_axi_adc_conv_register, IIO_ADI_AXI);
 
 static ssize_t in_voltage_scale_available_show(struct device *dev,
 					       struct device_attribute *attr,