qcacmn: Fix race between ser psoc close and vdev destroy handler

In wlan_serialization_psoc_disable the timers are freed without
holding lock and at the same time the
wlan_serialization_cleanup_vdev_timers from vdev destroy handler
is accessing the timers, this result in cleanup_vdev_timers
accessing freed timer memory resulting in assert.

Fix is to free timer memory while holding timer lock. Also as the
lock can be used by vdev delete handler after freeing in
psoc_disable, move the init and deinit of the lock to psoc create
and destroy handlers respectively.

Change-Id: Idf822a91022de6b51c7ee1895f71b6fb94fedd72
CRs-Fixed: 2721064