machine/stm32f4disco: add updated target file for newer version of board that have updated st-link

Signed-off-by: deadprogram <ron@hybridgroup.com>

targets/stm32f4disco-1.json

@@ -0,0 +1,4 @@
+{
+    "inherits": ["stm32f4disco"],
+    "openocd-interface": "stlink-v2-1"
+}