[BSP][ls1c]Modify kconfig RTT_DIR

bsp/ls1cdev/kconfig

@@ -1,6 +1,5 @@
 mainmenu "RT-Thread Configuration"
 
-
 config $BSP_DIR
     string
     option env="BSP_ROOT"
@@ -9,10 +8,7 @@ config $BSP_DIR
 config $RTT_DIR
     string
     option env="RTT_ROOT"
-    default "F:/rt-thread/rt-thread"
-    
-# you can change the RTT_ROOT default "../.." to your rtthread_root,
-# example : default "F:/git_repositories/rt-thread"
+    default "../.."
 
 config $PKGS_DIR
     string