ASoC: fsl: imx-es8328: Remove leftover gpio initialisation

The gpio field is not used anymore, remove the leftover.
This also fixes the compilation error after the ...

Fixes: 9855f05e ("ASoC: fsl: imx-es8328: Switch to using gpiod API")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240325191341.3977321-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-es8328.c

@@ -28,7 +28,6 @@ struct imx_es8328_data {
 
 static struct snd_soc_jack_gpio headset_jack_gpios[] = {
 	{
-		.gpio = -1,
 		.name = "headset-gpio",
 		.report = SND_JACK_HEADSET,
 		.invert = 0,