res: avoid recursive chmod/chrgp in udev rules

We shouldn't use chmod/chgrp recursively on paths in /sys. Sysfs often
uses symlinks to link back to the bus, parent, etc. so we might end up
changing permissions on the whole sysfs tree. We don't want that so only
change the required files, not all attributes.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>