Framework/connection/wifi verify

1.write SConscript of hfa21_wifi
2.modify Kconfig

APP_Framework/Framework/connection/wifi/hfa21_wifi/Kconfig

@@ -29,5 +29,7 @@ if ADD_NUTTX_FETURES
 endif
 
 if ADD_RTTHREAD_FETURES
-
+        config ADAPTER_HFA21_DRIVER
+                string "HFA21 device uart driver path"
+                default "/dev/uart3" 
 endif

APP_Framework/Framework/connection/wifi/hfa21_wifi/SConscript

@@ -0,0 +1,10 @@
+from building import *
+import os
+
+cwd = GetCurrentDir()
+src = []
+if GetDepend(['ADAPTER_HFA21_WIFI']):
+    src += ['hfa21_wifi.c']
+group = DefineGroup('connection wifi hfa21', src, depend = [], CPPPATH = [cwd])
+
+Return('group')