waf: Add Intel Aero to waf build

This will be the first board that only build with waf.

Tools/ardupilotwaf/boards.py

@@ -374,6 +374,14 @@ class pxfmini(linux):
             CONFIG_HAL_BOARD_SUBTYPE = 'HAL_BOARD_SUBTYPE_LINUX_PXFMINI',
         )
 
+class aero(linux):
+    def configure_env(self, cfg, env):
+        super(aero, self).configure_env(cfg, env)
+
+        env.DEFINES.update(
+            CONFIG_HAL_BOARD_SUBTYPE = 'HAL_BOARD_SUBTYPE_LINUX_AERO',
+        )
+
 class px4(Board):
     abstract = True
     toolchain = 'arm-none-eabi'