VSCode: Update OpenOCD launch.json to point to SVD fine & increase SW…

…D speed. (#78)

* VSCode: Update OpenOCD launch.json to increase swd speed.

nRF52 SWD max frequency is 8 MHz and setting this value
makes it a bit faster to launch and respond to commands.

* VSCode: Update launch_codal.json for OpenOCD to point to SVD files.

.vscode/launch.json

@@ -30,10 +30,14 @@
             "target/nrf52.cfg"
           ],
           "interface": "swd",
+          "svdFile": "libraries/codal-nrf52/nrfx/mdk/nrf52833.svd",
           "preLaunchCommands": [
             "load build/MICROBIT",
             "enable breakpoint",
             "monitor reset"
+          ],
+          "openOCDLaunchCommands": [
+            "adapter speed 8000"
           ]
       }
   ]