Revert "environment/material: memory leak fixes"

This reverts commit 3b5d2db843d3c6a08c30f8c6b7b85ee6d7c58402.
LifecycleController: memory leak fix
Ieee80211Mac: memory leak fix
mobility: Moban: memory leak fixes
InterfaceEntry: memory leak fix for generic network layer
icmp: memory leak fix
tcp_nsc: memory leak fix
IPv6Route: memory leak fix
voipstream: memory leak fixes
GenericRoute: memory leak fix
TMP