MAINTAINERS: do not use orphaned terminology

an area without maintainer is still considered active, calling it orphan
is a bit extreme. We have some areas that can be considered "orphaned",
those now will be covered with 'odd fixes' status, meaning that they
might have one or more collaborator and getting some changes from time
to time, but nothing beyond fixes and nobody driving the area beyond
where it is right now.

Even an area with a dedicated maintainer can be have the status of 'odd
fixes', i.e. there is a maintainer but the area is stale and no further
development is happening.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>