qcacmn: Add utility functions to set/get flow tag from skb cb

Tags are programmed using wlanconfig commands. Rx IPv4/v6
TCP/UDP packets matching a 5-tuple are tagged using HawkeyeV2 hardware.
Tags are populated in the skb->cb in the REO/exception/monitor data
path and sent to upper stack

CRs-Fixed: 2475913
Change-Id: I534a633b99a8b1c4c9aab71fbf5857710d7977a1
4 files changed