qcacmn: Support to enable/disable SWBA events in beacon offload

When SWBA event is enabled, the FW will sent an event to the
host on every TBTT beacon.
Note that, unlike the legacy offload chips, this event is not
used by the host to send out the beacon frame itself.

Change-Id: Icf4440d79f7dbfb544f9d98c4de0e84bdb150459
CRs-Fixed: 2200805
2 files changed