Improve error message if database is missing

If the chip configs database is missing, the tool should
provide a hint on how to fix the issue.

Change-Id: Iefbb5ecec9511e76e5ef2b547f5788144370fd28
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/em100/+/38284
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
1 file changed