spi: tegra: sequence compatible strings as per preference

Sequence compatible list for tegra20-slink driver to first
look for Tegra30 and then Tegra20. Tegra30 have additional
feature in HW which need to be utilize if it is provided from DT.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/spi/spi-tegra20-slink.c

@@ -1109,8 +1109,8 @@ const struct tegra_slink_chip_data tegra20_spi_cdata = {
 };
 
 static struct of_device_id tegra_slink_of_match[] __devinitconst = {
-	{ .compatible = "nvidia,tegra20-slink", .data = &tegra20_spi_cdata, },
 	{ .compatible = "nvidia,tegra30-slink", .data = &tegra30_spi_cdata, },
+	{ .compatible = "nvidia,tegra20-slink", .data = &tegra20_spi_cdata, },
 	{}
 };
 MODULE_DEVICE_TABLE(of, tegra_slink_of_match);