ppp: patch CVE-2024-58250

ppp: patch CVE-2024-58250

Backport patch to remove vulnerable component.

This is a breaking change, but there will be no other fix for this CVE
as upstream did the deletion without providing a fix first.
If someone really needs this feature, which the commit message describes
as deprecated, bbappend with patch removal is possible.

License-Update: passprompt plugin removed

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>