Update OpenOCD to v0.12.0-7

Resolves #906, resolves #908

Author: valeros

platform.json

@@ -322,7 +322,7 @@
       "type": "uploader",
       "optional": true,
       "owner": "platformio",
-      "version": "~3.1200.0"
+      "version": "~3.1200.7"
     },
     "tool-jlink": {
       "type": "uploader",

platform.py

@@ -201,8 +201,7 @@ def _add_default_debug_tools(self, board):
                         "Missing target configuration for %s" % board.id)
                     server_args.extend([
                         "-f", "interface/%s.cfg" % link,
-                        "-c", "transport select %s" % (
-                            "hla_swd" if link == "stlink" else "swd"),
+                        "-c", "transport select swd",
                         "-f", "target/%s.cfg" % debug.get("openocd_target")
                     ])
                     server_args.extend(debug.get("openocd_extra_args", []))