Add all currently clean directories.
Change-Id: Ibfb6432b485adb7fdc930f57ea0af4ff35921d37
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14332
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>