config/user.yml: Disable unstable uart test.

Signed-off-by: zhanglinjing <[email protected]>

Author: LinjingZhang

config/user.yml

@@ -22,7 +22,7 @@ unit-test:
   #  - unit-test-iic-4700
    - unit-test-iic-pingpong-4700
   #  - unit-test-uart-4700
-   - unit-test-uart-connected2-4700
+  #  - unit-test-uart-connected2-4700
   #  - unit-test-pulse-4700
 
 # kit_xmc14_2go