gpio: spacemit-k1: Add set_config callback support

Assign gpiochip_generic_config() to the set_config() callback to support
pin configuration through the GPIO subsystem. This allows users to
configure GPIO pin attributes like pull-up/down when specifying a GPIO
line in the Device Tree.

Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
Reviewed-by: Anand Moon <linux.amoon@gmail.com>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Yixun Lan <dlan@kernel.org>
Signed-off-by: Linus Walleij <linusw@kernel.org>

drivers/gpio/gpio-spacemit-k1.c

@@ -228,6 +228,7 @@ static int spacemit_gpio_add_bank(struct spacemit_gpio *sg,
 	gc->label		= dev_name(dev);
 	gc->request		= gpiochip_generic_request;
 	gc->free		= gpiochip_generic_free;
+	gc->set_config		= gpiochip_generic_config;
 	gc->ngpio		= SPACEMIT_NR_GPIOS_PER_BANK;
 	gc->base		= -1;
 	gc->of_gpio_n_cells	= 3;