allow to overwrite the detected system capabilities e.g. if devices
does not operate as bridge.
Signed-off-by: Sebastian Pflieger <sebastian@pflieger.email>
(cherry picked from commit 3ce909914a)
Link: https://github.com/openwrt/openwrt/pull/15299
Signed-off-by: Robert Marko <robimarko@gmail.com>