After contacting Moxa, I found out that they no longer maintain the
in-kernel driver, and instead maintain an updated driver as an external
patch.

This patch updates the documentation to reflect this.
Signed-off-by: James Nelson <james4765@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>