Merge pull request #2225 from weety/dev

[bsp][k210] Fixed Kconfig file Syntax error.

bsp/k210/Kconfig

@@ -8,7 +8,7 @@ config $BSP_DIR
 config $RTT_DIR
     string
     option env="RTT_ROOT"
-    default: "../.."
+    default "../.."
 
 config $PKGS_DIR
     string