platform/x86: int3472: For mt9m114 sensors map powerdown to powerenable

mt9m114 atomisp designs declare both reset and powerdown pins in their
GPIO type DSM, but the mt9m114 only has a reset pin. The powerdown pin
seems to control the regulators suppyling power to the sensor and
the privacy LED.

Add a mapping of powerdown to powerenable for the mt9m114 for this.

While at is also add a comment to document the ov7251 mapping.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20250507184737.154747-6-hdegoede@redhat.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: jwrdegoede

drivers/platform/x86/intel/int3472/discrete.c

@@ -142,6 +142,9 @@ struct int3472_gpio_map {
 };
 
 static const struct int3472_gpio_map int3472_gpio_map[] = {
+	/* mt9m114 designs declare a powerdown pin which controls the regulators */
+	{ "INT33F0", INT3472_GPIO_TYPE_POWERDOWN, INT3472_GPIO_TYPE_POWER_ENABLE, false, "vdd" },
+	/* ov7251 driver / DT-bindings expect "enable" as con_id for reset */
 	{ "INT347E", INT3472_GPIO_TYPE_RESET, INT3472_GPIO_TYPE_RESET, false, "enable" },
 };