Temporary overwrite bad definition of elm interrupt property in Linux

dts files. It may be removed once it will be fixed upstream.

This is done just to supresses a warning during dtb evaluation as
there is no elm driver in tree at present.

sys/boot/fdt/dts/arm/pandaboard-common.dtsi

@@ -41,6 +41,10 @@
 			reg = <0x48240200 0x20>;
 			interrupts = <GIC_PPI 11 (GIC_CPU_MASK_RAW(3) | IRQ_TYPE_LEVEL_HIGH)>;
 		};
+
+		elm: elm@48078000 {
+			interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+		};
 	};
 	chosen {
 		stdin = "serial2";