qcacld-3.0: Remove NDP_END_ALL request from serialization queue

Currently NDP_END_ALL request is posted to serialization queue but
not removed even after getting response from firmware. The timer
expires after 4 seconds and the message is gets dequeued as part
of timer handler. Dequeue the request from queue after getting
NDP_HOST_UPDATE from firmware to avoid blocking the northbound
APIs for this 4 seconds.

Change-Id: Ie8045f2460f7ac27732d4070ed79e5a61aab0bd2
CRs-Fixed: 2662869