Revert "oce(4): deprecate"

These are reportedly still in fairly wide use.

We strongly encourage folks with this hardware to post a dmesg on
dmesgd.nycbug.org.

This reverts commit 4591322980a37d6ee38a3ed70569366e16ca71f6.

Discussed with: brooks
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 8b012980b8cc5f8619cd552ee6df7b98b97c5d62)