iio: gyro: itg3200: 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 <javier@osg.samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/gyro/itg3200_core.c

@@ -377,9 +377,16 @@ static const struct i2c_device_id itg3200_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, itg3200_id);
 
+static const struct of_device_id itg3200_of_match[] = {
+	{ .compatible = "invensense,itg3200" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, itg3200_of_match);
+
 static struct i2c_driver itg3200_driver = {
 	.driver = {
 		.name	= "itg3200",
+		.of_match_table = itg3200_of_match,
 		.pm	= &itg3200_pm_ops,
 	},
 	.id_table	= itg3200_id,