ARM: dts: at91: fix i2c-gpio node name

i2c-gpio doesn't need a reg property. Change the node names to i2c-gpio-x
as used in other dts to remove the unit-address.

Solves:
Warning (unit_address_vs_reg): Node /i2c@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /i2c@1 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /i2c@2 has a unit name, but no reg property

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/arch/arm/boot/dts/at91sam9263.dtsi b/arch/arm/boot/dts/at91sam9263.dtsi
index 9344642..aeb1a36 100644
--- a/arch/arm/boot/dts/at91sam9263.dtsi
+++ b/arch/arm/boot/dts/at91sam9263.dtsi
@@ -1019,7 +1019,7 @@
 		};
 	};
 
-	i2c@0 {
+	i2c-gpio-0 {
 		compatible = "i2c-gpio";
 		gpios = <&pioB 4 GPIO_ACTIVE_HIGH /* sda */
 			 &pioB 5 GPIO_ACTIVE_HIGH /* scl */