prima: Mutex lock is not released by wlan_logging_thread

While unloading driver, wlan_logging_thread never release
param_lock by waiting for logging sock deactivation.

Instead of complete_and_exit() API use complete() API to
complete shutdown_comp which releases the mutex lock.

Change-Id: Id5ccc5dbcfe42646452d6b4736d821f6d64ca5b7
CRs-Fixed: 2306246