Get a basic USB device working

It enumerates, takes its address, gets configured, and then Linux kind
of gives up because it has no endpoints.

Change-Id: I01f75acee419b585e455f428ee45bcd37f0ce189
diff --git a/tools/ci/run-tests.sh b/tools/ci/run-tests.sh
index 98762e7..cac8dce 100755
--- a/tools/ci/run-tests.sh
+++ b/tools/ci/run-tests.sh
@@ -3,3 +3,4 @@
 
 bazel --batch test -c opt --curses=no --color=no --jobs=1 //...
 bazel --batch build -c opt --curses=no --color=no --jobs=1 //... --cpu=roborio
+bazel --batch build -c opt --curses=no --color=no --jobs=1 //motors/... --cpu=cortex-m4f