[bsp][qemu-vexpress-a9] Update eclipse project.

bsp/qemu-vexpress-a9/.project

@@ -20,6 +20,7 @@
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.cdt.core.cnature</nature>
+		<nature>org.eclipse.cdt.core.rttnature</nature>
 		<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
 		<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
 	</natures>