ASoC: tegra: rename Tegra20-specific driver files

Rename these files so they include a specific hardware version in their
filenames. The contents is only touched minimally so that git's rename
tracking operates correctly; renaming all symbols in the files results
in a diff so large that the rename detection fails.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/tegra/Makefile b/sound/soc/tegra/Makefile
index 714d360..4a33884 100644
--- a/sound/soc/tegra/Makefile
+++ b/sound/soc/tegra/Makefile
@@ -1,15 +1,15 @@
 # Tegra platform Support
 snd-soc-tegra-pcm-objs := tegra_pcm.o
 snd-soc-tegra-utils-objs += tegra_asoc_utils.o
-snd-soc-tegra-das-objs := tegra_das.o
-snd-soc-tegra-i2s-objs := tegra_i2s.o
-snd-soc-tegra-spdif-objs := tegra_spdif.o
+snd-soc-tegra20-das-objs := tegra20_das.o
+snd-soc-tegra20-i2s-objs := tegra20_i2s.o
+snd-soc-tegra20-spdif-objs := tegra20_spdif.o
 
 obj-$(CONFIG_SND_SOC_TEGRA) += snd-soc-tegra-pcm.o
 obj-$(CONFIG_SND_SOC_TEGRA) += snd-soc-tegra-utils.o
-obj-$(CONFIG_SND_SOC_TEGRA_DAS) += snd-soc-tegra-das.o
-obj-$(CONFIG_SND_SOC_TEGRA_I2S) += snd-soc-tegra-i2s.o
-obj-$(CONFIG_SND_SOC_TEGRA_SPDIF) += snd-soc-tegra-spdif.o
+obj-$(CONFIG_SND_SOC_TEGRA_DAS) += snd-soc-tegra20-das.o
+obj-$(CONFIG_SND_SOC_TEGRA_I2S) += snd-soc-tegra20-i2s.o
+obj-$(CONFIG_SND_SOC_TEGRA_SPDIF) += snd-soc-tegra20-spdif.o
 
 # Tegra machine Support
 snd-soc-tegra-wm8903-objs := tegra_wm8903.o