In the monitor mode case if some entry status entries are
not received then after the next monitor interface up host tries
to process pending old destination ring entries. As host drops
1 destination entry after processing 16 status entries if the entry
is not present in the status ring. which in case there is a high
number of old entries in the destination ring will result in the
destination ring getting full.
To fix the issue force flush monitor destination ring
during vdev delete.
Change-Id: Ie23a57add7b5bd372ab66f801e29e55cfacb5d4d
CRs-Fixed: 3411943
5cfdbdb306