Added nuttx sim config.

Makefile

@@ -9,7 +9,6 @@ nuttx_px4fmu-v2_simple:
 px4fmu-v2_simple: nuttx_px4fmu-v2_simple
 
 nuttx_sim_simple:
-	echo "nuttx-sim-simple is a work in progress"
 	mkdir -p $d/build_$@ && cd $d/build_$@ && \
 		cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/Toolchain-native.cmake \
 		-DOS=nuttx -DBOARD=sim -DLABEL=simple && \

cmake/configs/config_nuttx_sim_simple.cmake

@@ -0,0 +1,23 @@
+include(nuttx/px4_impl_nuttx)
+
+message(WARNING "this is a work in progress and doesn't build yet")
+
+function(px4_set_config_modules out_module_list)
+
+	set(config_module_list
+		platforms/nuttx
+		platforms/nuttx/px4_layer
+		platforms/common
+		drivers/led
+		drivers/device
+		modules/systemlib
+		modules/uORB
+		examples/px4_simple_app
+		lib/mathlib/math/filter
+		lib/conversion
+		)
+
+	set(${out_module_list} ${config_module_list} PARENT_SCOPE)
+
+endfunction()
+