This is an initial attempt to unify all kinds of activity LED
functionality in various kernel drivers by implementing an additional
layer between simple LED triggers and device drivers.

I started this project as I'm working on activity LED support for serial
ports in parallel where I mainly duplicated code from the CAN stack.
Once serial port LED support has been mainlined, there's going to be
at least one more device driver taking advantage of ledtrig-activity
besides arcnet and can.