arm: imx: add tzic interrupt controller for imx53

Since commit 999a78d5cf ("scripts/dtc: Update to upstream version v1.4.5-3-gb1a60033c110")
dtc warns about:
arch/arm/dts/imx53-cx9020.dtb: Warning (interrupts_property): Missing interrupt-parent for /soc/aips@50000000/serial@53fc0000
arch/arm/dts/imx53-cx9020.dtb: Warning (interrupts_property): Missing interrupt-parent for /soc/aips@50000000/ccm@53fd4000
arch/arm/dts/imx53-cx9020.dtb: Warning (interrupts_property): Missing interrupt-parent for /soc/aips@50000000/gpio@53fe4000
arch/arm/dts/imx53-cx9020.dtb: Warning (interrupts_property): Missing interrupt-parent for /soc/aips@60000000/sdma@63fb0000
arch/arm/dts/imx53-cx9020.dtb: Warning (interrupts_property): Missing interrupt-parent for /soc/aips@60000000/ethernet@63fec000

Fix this by adding a node for the tzic interrupt controller.
Copied from "<Linux>/arch/arm/boot/dts/imx53.dts"

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

arch/arm/dts/imx53.dtsi

@@ -23,10 +23,18 @@
 		serial1 = &uart2;
 	};
 
+	tzic: tz-interrupt-controller@fffc000 {
+		compatible = "fsl,imx53-tzic", "fsl,tzic";
+		interrupt-controller;
+		#interrupt-cells = <1>;
+		reg = <0x0fffc000 0x4000>;
+	};
+
 	soc {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "simple-bus";
+		interrupt-parent = <&tzic>;
 		ranges;
 
 		aips@50000000 { /* AIPS1 */