pinctrl: a3700: Fix the issue that gpio controller is registered with wrong node id

In armada_37xx_gpiochip_register, the return value of fdtdec_get_bool
should be true when gpio-controller is found; current codes makes a
wrong inverse return value judgement, this patch fixes it.

Signed-off-by: Ken Ma <make@marvell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Wilson Ding <dingwei@marvell.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>

drivers/pinctrl/mvebu/pinctrl-armada-37xx.c

@@ -539,7 +539,7 @@ static int armada_37xx_gpiochip_register(struct udevice *parent,
 	}
 
 	fdt_for_each_subnode(subnode, blob, node) {
-		if (!fdtdec_get_bool(blob, subnode, "gpio-controller")) {
+		if (fdtdec_get_bool(blob, subnode, "gpio-controller")) {
 			ret = 0;
 			break;
 		}