Move support of Realtek 8156/8156B from cdce(4) to ure(4)
Reviewed by: kevlo, imp, hrs
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D45088
(cherry picked from commit 6ea4d95f6c76aa64d2db5c04c87e68dc299544df)