Thanks to the log_terminal server, we no longer rely on a separate UART
for the noux output. We also skip the indirection of using a tar archive
but rather start the test-noux_form program as a mounted ROM module.
This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.
Issue #1082