coresight: Remove obsolete reference to "owner" in CoreSight descriptor

Field "owner" of struct coresight_desc has been removed a while back but
the documentation was not updated to reflect the changes.
Signed-off-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/trace/coresight.txt

@@ -187,9 +187,6 @@ that can be performed on them (see "struct coresight_ops").  The
 specific to that component only.  "Implementation defined" customisations are
 expected to be accessed and controlled using those entries.
 
-Last but not least, "struct module *owner" is expected to be set to reflect
-the information carried in "THIS_MODULE".
-
 How to use the tracer modules
 -----------------------------