Sync t125 from asn1.

This adds "Remove unused hf entries" from Anders.

Change-Id: I1150f34f0eafab03415339d4b34f5f2e7f69f85b
Reviewed-on: https://code.wireshark.org/review/3499
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Stig Bjørlykke <stig@bjorlykke.org>