ASN1: Register PDU-dissectors as NEW

Change-Id: I1a317b19d8076588c9305dae6287bb80cc14da64
Reviewed-on: https://code.wireshark.org/review/4494
Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Stig Bjørlykke <stig@bjorlykke.org>