qcacld-3.0: Reinitialize mon_register_event before wait_for_completion

Reinitialize mon_register_event before wait_for_completion
to make sure that it waits for fresh completion.

"done" variable in struct completion increments in
complete() API and decrements in wait_for_completion() API.

In wait_for_completion() API, if "done" value is 0 then
it will wait for the completion else it will continue without
waiting.

If reinitialization is not done, there is a possibility that
wait_for_completion() may continue without waiting.

Change-Id: I780103f551938438f27a11b006cc7c3e6edc6820
CRs-Fixed: 3251876