iio: magnetometer: bmc150_magn_i2c: Add OF device ID table

The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.

But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/magnetometer/bmc150_magn_i2c.c

···
 };
 MODULE_DEVICE_TABLE(i2c, bmc150_magn_i2c_id);
 
+static const struct of_device_id bmc150_magn_of_match[] = {
+	{ .compatible = "bosch,bmc150_magn" },
+	{ .compatible = "bosch,bmc156_magn" },
+	{ .compatible = "bosch,bmm150_magn" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bmc150_magn_of_match);
+
 static struct i2c_driver bmc150_magn_driver = {
 	.driver = {
 		.name	= "bmc150_magn_i2c",
+		.of_match_table = bmc150_magn_of_match,
 		.acpi_match_table = ACPI_PTR(bmc150_magn_acpi_match),
 		.pm	= &bmc150_magn_pm_ops,
 	},