remove obsolete tokenring maintainer information

- Peter's email address is bouncing
- the project webpage no longer exists
- neither Peter nor Mike had a single patch included in the kernel
  since 2.6.12-rc2 (when the git history begins)

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>