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>

arch/arm/mach-tegra/board-harmony.c

@@ -70,6 +70,7 @@ static struct platform_device debug_uart = {
 static struct tegra_wm8903_platform_data harmony_audio_pdata = {
 	.gpio_spkr_en		= TEGRA_GPIO_SPKR_EN,
 	.gpio_hp_det		= TEGRA_GPIO_HP_DET,
+	.gpio_hp_mute		= -1,
 	.gpio_int_mic_en	= TEGRA_GPIO_INT_MIC_EN,
 	.gpio_ext_mic_en	= TEGRA_GPIO_EXT_MIC_EN,
 };

arch/arm/mach-tegra/include/mach/tegra_wm8903_pdata.h

@@ -17,6 +17,7 @@
 struct tegra_wm8903_platform_data {
 	int gpio_spkr_en;
 	int gpio_hp_det;
+	int gpio_hp_mute;
 	int gpio_int_mic_en;
 	int gpio_ext_mic_en;
 };