[tr064] Enhancements, code improvements and fixes (#14468)

Signed-off-by: Jan N. Klug <github@klug.nrw>

CODEOWNERS

@@ -339,7 +339,7 @@
 /bundles/org.openhab.binding.touchwand/ @roieg
 /bundles/org.openhab.binding.tplinkrouter/ @olivierkeke
 /bundles/org.openhab.binding.tplinksmarthome/ @Hilbrand
-/bundles/org.openhab.binding.tr064/ @openhab/add-ons-maintainers
+/bundles/org.openhab.binding.tr064/ @J-N-K
 /bundles/org.openhab.binding.tradfri/ @cweitkamp @kaikreuzer
 /bundles/org.openhab.binding.twitter/ @computergeek1507
 /bundles/org.openhab.binding.unifi/ @mgbowman @Hilbrand