[bsp] Fixed the wrong output infomation in Kconfig

RT-Thrad -> RT-Thread

bsp/amebaz/libraries/Kconfig

@@ -1,7 +1,7 @@
 menu "External Libraries"
 
     config RT_USING_SMARTCONFIG_LIB
-        bool "Using RT-Thrad SmartConfig Library"
+        bool "Using RT-Thread SmartConfig Library"
         default n
 
 endmenu