iio:accel:adxl345: Move exports into IIO_ADXL345 namespace

To avoid unnecessary pollution of the global symbol namespace move the
driver core exports into their own namespace and import that into the two
bus modules.

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

drivers/iio/accel/adxl345_core.c

···
 
 	return devm_iio_device_register(dev, indio_dev);
 }
-EXPORT_SYMBOL_GPL(adxl345_core_probe);
+EXPORT_SYMBOL_NS_GPL(adxl345_core_probe, IIO_ADXL345);
 
 MODULE_AUTHOR("Eva Rachel Retuya <[e-mail]>");
 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer core driver");

drivers/iio/accel/adxl345_i2c.c

···
 MODULE_AUTHOR("Eva Rachel Retuya <[e-mail]>");
 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer I2C driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_ADXL345);

drivers/iio/accel/adxl345_spi.c

···
 MODULE_AUTHOR("Eva Rachel Retuya <[e-mail]>");
 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_ADXL345);