Remove unused mDNS filter from ApfFilter

Removed the existing, unused mDNS filter from ApfFilter.java due to
known limitations (e.g., handling only one question per packet). A
proper APFv6-based mDNS offload implementation will be added in a
subsequent change.

Test: TH
Change-Id: I155be4c16fd45afee51b1cac8129edacceb24470
2 files changed