iio:accel:bmc150: Move exports into IIO_BMC150 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.

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

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

drivers/iio/accel/bmc150-accel-core.c

···
 	.val_bits = 8,
 	.max_register = 0x3f,
 };
-EXPORT_SYMBOL_GPL(bmc150_regmap_conf);
+EXPORT_SYMBOL_NS_GPL(bmc150_regmap_conf, IIO_BMC150);
 
 static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
 				 enum bmc150_power_modes mode,
···
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(bmc150_accel_core_probe);
+EXPORT_SYMBOL_NS_GPL(bmc150_accel_core_probe, IIO_BMC150);
 
 void bmc150_accel_core_remove(struct device *dev)
 {
···
 	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
 			       data->regulators);
 }
-EXPORT_SYMBOL_GPL(bmc150_accel_core_remove);
+EXPORT_SYMBOL_NS_GPL(bmc150_accel_core_remove, IIO_BMC150);
 
 #ifdef CONFIG_PM_SLEEP
 static int bmc150_accel_suspend(struct device *dev)
···
 	SET_RUNTIME_PM_OPS(bmc150_accel_runtime_suspend,
 			   bmc150_accel_runtime_resume, NULL)
 };
-EXPORT_SYMBOL_GPL(bmc150_accel_pm_ops);
+EXPORT_SYMBOL_NS_GPL(bmc150_accel_pm_ops, IIO_BMC150);
 
 MODULE_AUTHOR("Srinivas Pandruvada <[e-mail]>");
 MODULE_LICENSE("GPL v2");

drivers/iio/accel/bmc150-accel-i2c.c

···
 MODULE_AUTHOR("Srinivas Pandruvada <[e-mail]>");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("BMC150 I2C accelerometer driver");
+MODULE_IMPORT_NS(IIO_BMC150);

drivers/iio/accel/bmc150-accel-spi.c

···
 MODULE_AUTHOR("Markus Pargmann <[e-mail]>");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("BMC150 SPI accelerometer driver");
+MODULE_IMPORT_NS(IIO_BMC150);