realtek: use automatic GPIO numbering for RTL8231

Set the gpio_chip.base to -1 to use automatic GPIO line indexing.
Setting base to 0 or a positive number is deprecated and should not be
used.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Tested-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c

@@ -311,7 +311,7 @@ static int rtl8231_gpio_probe(struct platform_device *pdev)
 	rtl8231_init(gpios);
 
 	gpios->dev = dev;
-	gpios->gc.base = 160;
+	gpios->gc.base = -1;
 	gpios->gc.ngpio = 37;
 	gpios->gc.label = "rtl8231";
 	gpios->gc.parent = dev;