ARM: Tegra: Add to tegra_wm8903_platform_data
Seaboard derivate Kaen has a GPIO to mute the headphone output. Add a field to tegra_wm8903_platform_data so the board files can pass the GPIO number for that to the ASoC machine driver. Also, initialize this new field to a "not present" value for Harmony. Signed-off-by: NStephen Warren <swarren@nvidia.com> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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