staging: vt6656: lock changes: bMgrPrepareBeaconToSend add lock.

bMgrPrepareBeaconToSend is nolonger atomic

csBeacon_xmit must be locked add spin lock.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>