Register the dicom dissector by name so it can be used with SSL.

Bug: 10450
Change-Id: I786de3de39c6d4829135b67a64936c28757d1ff4
Reviewed-on: https://code.wireshark.org/review/4038
Reviewed-by: Evan Huus <eapache@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
(cherry picked from commit 412662afb3c404df5a1e5e19988b0df8d594267a)
Reviewed-on: https://code.wireshark.org/review/4055
Reviewed-by: Michael Mann <mmann78@netscape.net>
Reviewed-by: Jeff Morriss <jeff.morriss.ws@gmail.com>