platform/x86: int3472: Drop unused gpio field from struct int3472_gpio_regulator

platform/x86: int3472: Drop unused gpio field from struct int3472_gpio_regulator

The gpio field in struct int3472_gpio_regulator is only briefly used to
store the GPIO in skl_int3472_register_regulator(). Instead just store
the GPIO directly into cfg.ena_gpiod an drop the gpio field.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: David Heidelberg <david@ixit.cz>  # Dell Latitude 9440
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://lore.kernel.org/r/20250417111337.38142-4-hdegoede@redhat.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>