IOB: Remove unimplemented VLAN stuff; add unit test and fixes to pass unit test
IOB: Need to clone header when deleting the first entry in an I/O buffer chain
IOB:  More clean based on change of the last commit
IOB: Fix typo in debug assertion
IOB: Add iob_clone()
Add iob_freechain
SAMA5D4:  Add L2CC register definition header file (incomplete)
ChangeLog update
IOB:  Fix bugs in trimming logic