ASoC: tegra: utils: Don't use of_have_populated_dt()

Recent list discussions concluded that drivers should not be calling
of_have_populated_dt(), and hence of_have_populated_dt() should not be
exported. Use a different mechanism to detect DT vs. non-DT boot.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/tegra/tegra_asoc_utils.c

@@ -119,13 +119,15 @@ int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
 
 	data->dev = dev;
 
-	if (!of_have_populated_dt())
-		data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA20;
-	else if (of_machine_is_compatible("nvidia,tegra20"))
+	if (of_machine_is_compatible("nvidia,tegra20"))
 		data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA20;
 	else if (of_machine_is_compatible("nvidia,tegra30"))
 		data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA30;
+	else if (!dev->of_node)
+		/* non-DT is always Tegra20 */
+		data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA20;
 	else
+		/* DT boot, but unknown SoC */
 		return -EINVAL;
 
 	data->clk_pll_a = clk_get_sys(NULL, "pll_a");