spi: spidev: Add Rohm DH2228FV DAC compatible string

Since we don't have a driver for it yet, use spidev instead.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/spi/spidev.c

@@ -645,6 +645,7 @@ static int __devexit spidev_remove(struct spi_device *spi)
 }
 
 static const struct of_device_id spidev_dt_ids[] = {
+	{ .compatible = "rohm,dh2228fv" },
 	{},
 };