ARM: dts: remove blank interrupt-parent properties

These were incorrectly introduced and can cause problems for of_irq_init.

The correct way to define a root controller is no interrupt-parent set at
all or the interrupt-parent is set to the root controller itself when
inherited from a parent node.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Tested-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/boot/dts/at91sam9g20.dtsi

@@ -55,7 +55,6 @@ aic: interrupt-controller@fffff000 {
 				#interrupt-cells = <2>;
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
-				interrupt-parent;
 				reg = <0xfffff000 0x200>;
 			};
 

arch/arm/boot/dts/at91sam9g45.dtsi

@@ -56,7 +56,6 @@ aic: interrupt-controller@fffff000 {
 				#interrupt-cells = <2>;
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
-				interrupt-parent;
 				reg = <0xfffff000 0x200>;
 			};
 

arch/arm/boot/dts/at91sam9x5.dtsi

@@ -54,7 +54,6 @@ aic: interrupt-controller@fffff000 {
 				#interrupt-cells = <2>;
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
-				interrupt-parent;
 				reg = <0xfffff000 0x200>;
 			};
 

arch/arm/boot/dts/db8500.dtsi

@@ -24,7 +24,6 @@ intc: interrupt-controller@a0411000 {
 			#interrupt-cells = <3>;
 			#address-cells = <1>;
 			interrupt-controller;
-			interrupt-parent;
 			reg = <0xa0411000 0x1000>,
 			      <0xa0410100 0x100>;
 		};

arch/arm/boot/dts/highbank.dts

@@ -89,7 +89,6 @@ intc: interrupt-controller@fff11000 {
 			#size-cells = <0>;
 			#address-cells = <1>;
 			interrupt-controller;
-			interrupt-parent;
 			reg = <0xfff11000 0x1000>,
 			      <0xfff10100 0x100>;
 		};