The new flag will be used by receive side encryption offloads to distinguish between
 packets that the hardware has decrypted and packets which must be descrypted
 by software. The LRO code also needs to be updated because the encrypted flag
 follows the mbuf packet header and the encrypted and non-encrypted data
 should not be coalesced into the same mbuf chain. Simply do this by adding a
 LRO decrypted flag to the address structure.
MFC after:      1 week
Sponsored by:   NVIDIA Networking