Improve uninstall stanza for d235j-xbox360-controller-driver

Explicitly unload kexts and launch service installed with the
driver. Manually delete symlink in /System/Library/Extensions
that is not removed elsewhere and causes a warning to be raised
if left after uninstall.
Merge pull request #8515 from jawshooah/d235j-xbox360-controller-driver

Improve uninstall stanza for d235j-xbox360-controller-driver