The issue is quite simple. The udevd rules says that the macro SYSFS{}= is going to be removed soon and to substitute it with ATTR{}= or ATTRS{}= sys-fs/udev-149 If you need more information, just ask.
The solution it's trivial. The new rule file should contain ATTR instead of SYSFS. A single sed inline should be enough
Fixed in 1.5.90-r1. Thanks for reporting.