tegra: i2c: Change driver to use helper function

Now that we have uclass_first_device_drvdata(), use it from the I2C driver
to reduce code duplication.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

drivers/i2c/tegra_i2c.c

@@ -499,18 +499,7 @@ static int tegra_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
 
 int tegra_i2c_get_dvc_bus(struct udevice **busp)
 {
-	struct udevice *bus;
+	return uclass_first_device_drvdata(UCLASS_I2C, TYPE_DVC, busp);
-
-	for (uclass_first_device(UCLASS_I2C, &bus);
-	     bus;
-	     uclass_next_device(&bus)) {
-		if (dev_get_driver_data(bus) == TYPE_DVC) {
-			*busp = bus;
-			return 0;
-		}
-	}
-
-	return -ENODEV;
 }
 
 static const struct dm_i2c_ops tegra_i2c_ops = {