ASoC: tegra: complete Tegra->Tegra20 renaming

Rename Tegra20-specific Kconfig variables, module filenames, all internal
symbol names, clocks, and platform devices, to reflect the fact the DAS
and I2S drivers are for a specific HW version.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/tegra/tegra_wm8903.c b/sound/soc/tegra/tegra_wm8903.c
index 2f9e9ff..0b0df49 100644
--- a/sound/soc/tegra/tegra_wm8903.c
+++ b/sound/soc/tegra/tegra_wm8903.c
@@ -350,8 +350,8 @@
 	.name = "WM8903",
 	.stream_name = "WM8903 PCM",
 	.codec_name = "wm8903.0-001a",
-	.platform_name = "tegra-i2s.0",
-	.cpu_dai_name = "tegra-i2s.0",
+	.platform_name = "tegra20-i2s.0",
+	.cpu_dai_name = "tegra20-i2s.0",
 	.codec_dai_name = "wm8903-hifi",
 	.init = tegra_wm8903_init,
 	.ops = &tegra_wm8903_ops,