uscanner

[nia <nia%NetBSD.org@localhost>]

hi tech-kern,

The uscanner driver only exists for compatibility with userspace Linux
software that uses an interface that was already deprecated by Linux
in 2004. All scanner software these days uses ugen.

I think we should remove this driver in case someone mistakenly
enables it thinking it will help them scan things when in reality
enabling the driver will just break scanning.