ARM: Tegra: Rename harmony_audio.h -> tegra_wm8903_pdata.h

The audio driver will soon support more than just the Tegra Harmony board.
Rename the platform data header file and data type to reflect this.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>