arm64: a37xx: dts: Fix the number of GPIO on south bridge

The number of pins in South Bridge is 30 and not 29. There is a fix for
the driver for the pinctrl, but a fix is also need at device tree level
for the GPIO.

Reviewed-on: http://vgitil04.il.marvell.com:8080/43286
Reviewed-by: Hua Jing <jinghua@marvell.com>
Tested-by: iSoC Platform CI <ykjenk@marvell.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>

arch/arm/dts/armada-37xx.dtsi

@@ -168,7 +168,7 @@
 				reg = <0x18800 0x100>, <0x18C00 0x20>;
 				gpiosb: gpiosb {
 					#gpio-cells = <2>;
-					gpio-ranges = <&pinctrl_sb 0 0 29>;
+					gpio-ranges = <&pinctrl_sb 0 0 30>;
 					gpio-controller;
 					interrupts =
 					<GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,