Since we've removed them from the tree, add a check to keep them out.
Change-Id: I2995da765fee8796a297963d54a1c34f56376efe
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/17658
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>