ASoC: Tegra: Rename harmony.c to tegra_wm8903.c

Soon, this machine driver will be updated to handle a number of Tegra boards
using the WM8903 codec. Rename the file in advance to reflect this.

Fix the content of tegra_wm8903.c to match the rename; replace references
to Harmony board with something more generic.

* s/struct tegra_harmony/struct tegra_wm8903/
* s/harmony/machine/ # variable name
* Similar rename for some functions
* Similar comment fix
* Similar MODULE_DESCRIPTION fix

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/tegra/Kconfig b/sound/soc/tegra/Kconfig
index 66b504f..9e53fec 100644
--- a/sound/soc/tegra/Kconfig
+++ b/sound/soc/tegra/Kconfig
@@ -14,13 +14,14 @@
 	  Tegra I2S interface. You will also need to select the individual
 	  machine drivers to support below.
 
-config SND_TEGRA_SOC_HARMONY
-	tristate "SoC Audio support for Tegra Harmony reference board"
+config SND_TEGRA_SOC_WM8903
+	tristate "SoC Audio support for Tegra boards using a WM8903 codec"
 	depends on SND_TEGRA_SOC && MACH_HARMONY && I2C
 	default m
 	select SND_TEGRA_SOC_I2S
 	select SND_SOC_WM8903
 	help
-	  Say Y or M here if you want to add support for SoC audio on the
-	  Tegra Harmony reference board.
+	  Say Y or M here if you want to add support for SoC audio on Tegra
+	  boards using the WM8093 codec. Currently, the only supported board
+	  is Harmony.