ARM: dts: gemini-dlink-dns-313: rename gpio-i2c to i2c

This fixes dtcheck warning:
arch/arm/boot/dts/gemini-dlink-dns-313.dt.yaml: gpio-i2c: $nodename:0: 'gpio-i2c' does not match '^i2c(@.*)?'
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/gemini-dlink-dns-313.dts

@@ -82,7 +82,7 @@ fan0: gpio-fan {
 
 
 	/* Global Mixed-Mode Technology G751 mounted on GPIO I2C */
-	gpio-i2c {
+	i2c {
 		compatible = "i2c-gpio";
 		sda-gpios = <&gpio0 15 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
 		scl-gpios = <&gpio0 16 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;