ARM: dts: Versatile: Use syscon as node name for IB2

The IB2 syscon should not have any funny names, just call
it syscon@ as per the convention so the schema will apply
properly.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/versatile-ab-ib2.dts

@@ -10,7 +10,7 @@ / {
 	model = "ARM Versatile AB + IB2 board";
 
 	/* Special IB2 control register */
-	ib2_syscon@27000000 {
+	syscon@27000000 {
 		compatible = "arm,versatile-ib2-syscon", "syscon", "simple-mfd";
 		reg = <0x27000000 0x4>;