ARM: dts: ls1021a: remove "simple-bus" compatible from ifc node

The binding of ifc device has been updated.  Update dts to match
accordingly.
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a.dtsi

@@ -123,7 +123,7 @@ msi2: msi-controller@1570e08 {
 		};
 
 		ifc: ifc@1530000 {
-			compatible = "fsl,ifc", "simple-bus";
+			compatible = "fsl,ifc";
 			reg = <0x0 0x1530000 0x0 0x10000>;
 			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
 			status = "disabled";