gpio: spacemit: Add missing MODULE_DEVICE_TABLE

The gpio-spacemit-k1 driver can be compiled as a module. Add missing
MODULE_DEVICE_TABLE so it can be matched by modalias and automatically
loaded by udev.

Fixes: d005532 ("gpio: spacemit: add support for K1 SoC")
Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Link: https://lore.kernel.org/r/20250613-k1-gpio-of-table-v1-1-9015da8fdfdb@iscas.ac.cn
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: dramforever

drivers/gpio/gpio-spacemit-k1.c

@@ -278,6 +278,7 @@ static const struct of_device_id spacemit_gpio_dt_ids[] = {
 	{ .compatible = "spacemit,k1-gpio" },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, spacemit_gpio_dt_ids);
 
 static struct platform_driver spacemit_gpio_driver = {
 	.probe		= spacemit_gpio_probe,