brcm47xx: remove versions from linksys-e1000 target

The target name does not need to included a revision
if all revisions are supported.
This target supports all revisions (v1, v2, v2.1).

Signed-off-by: Moritz Warning <moritzwarning@web.de>
[Keep the version numbers in the device title, it doesn't harm]
Signed-off-by: Mathias Kresin <dev@kresin.me>