util/lint/kconfig_lint: Add 3 new checks

- Check that selected symbols are type bool
- Check that selected symbols aren't created inside a choice
- Check that symbols created inside a choice aren't created
outside of a choice as well.

Change-Id: I08963d637f8bdfb2413cfe831eafdc974d7674ab
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12969
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed