Create a new function which has the non-UI parts of ensure_board_list().
Add some tests for everything except the N: tag.
While we are here, fix the confusing usage of fname inside a loops that
also uses fname.
Signed-off-by: Simon Glass <sjg@chromium.org>
Add a test for this code. It requires some defconfig files and a test
Kconfig to work with, so copy these into the temporary directory at the
start.
Signed-off-by: Simon Glass <sjg@chromium.org>