remove: 移除子模块w60x.已经合并到bsp/air640w/rtt目录

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "bsp/w60x"]
-	path = bsp/w60x
-	url = https://github.com/openLuat/LuatOS-W60x.git
 [submodule "qemu-vexpress-a9"]
 	path = bsp/qemu-vexpress-a9
 	url = https://github.com/openLuat/LuatOS-qemu-vexpress-a9.git