spi/tegra: Use engineering names in DT compatible property

Engineering names are more stable than marketing names. Hence, use them
for Device Tree compatible properties instead.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

Documentation/devicetree/bindings/spi/spi_nvidia.txt

 NVIDIA Tegra 2 SPI device
 
 Required properties:
-- compatible : should be "nvidia,tegra250-spi".
+- compatible : should be "nvidia,tegra20-spi".
 - gpios : should specify GPIOs used for chipselect.

drivers/spi/spi-tegra.c

@@ -598,7 +598,7 @@ MODULE_ALIAS("platform:spi_tegra");
 
 #ifdef CONFIG_OF
 static struct of_device_id spi_tegra_of_match_table[] __devinitdata = {
-	{ .compatible = "nvidia,tegra250-spi", },
+	{ .compatible = "nvidia,tegra20-spi", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, spi_tegra_of_match_table);