contributor-guide: discourage marking patches as Inappropriate

It was never really clear what all those reasons really meant, and every
patch submitted upstream liftens the maintenance on the Yocto side.
So remove the current list, and replace it with two reasons in which an
upstream submission likely won't benefit the upstream project.

Suggested-by: Alexander Kanavin <alex.kanavin@gmail.com>
(From yocto-docs rev: e0aabb7f3e7cd28a22224740eeb794a86ab34886)

Signed-off-by: Roland Hieber <rhi@pengutronix.de>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

documentation/contributor-guide/recipe-style-guide.rst

@@ -314,22 +314,20 @@ following status strings:
 
 ``Inappropriate [reason]``
    The patch is not appropriate for upstream, include a brief reason on the
-   same line enclosed with ``[]``. The reason can be:
+   same line enclosed with ``[]``. In the past, there were several different
+   reasons not to submit patches upstream, but we have to consider that every
+   non-upstreamed patch means a maintainance burden for recipe maintainers.
+   Currently, the only reasons to mark patches as inappropriate for upstream
+   submission are:
 
-   -  ``not author`` (you are not the author and do not intend to upstream this,
-      the source must be listed in the comments)
-   -  ``native``
-   -  ``licensing``
-   -  ``configuration``
-   -  ``enable feature``
-   -  ``disable feature``
-   -  ``bugfix`` (add bug URL here)
-   -  ``embedded specific``
-   -  ``other`` (give details in comments)
-
-The various ``Inappropriate [reason]`` status items are meant to indicate that
-the person responsible for adding this patch to the system does not intend to
-upstream the patch for a specific reason.
+   -  ``oe specific``: the issue is specific to how OpenEmbedded performs builds
+      or sets things up at runtime, and can be resolved only with a patch that
+      is not however relevant or appropriate for general upstream submission.
+   -  ``upstream ticket <link>``: the issue is not specific to Open-Embedded
+      and should be fixed upstream, but the patch in its current form is not
+      suitable for merging upstream, and the author lacks sufficient expertise
+      to develop a proper patch. Instead the issue is handled via a bug report
+      (include link).
 
 Of course, if another person later takes care of submitting this patch upstream,
 the status should be changed to ``Submitted [where]``, and an additional