Replace qdf timers with HR timer for pre CAC timeout and process
the preCAC completion work in workqueuecontext.
Since preCAC expiry is processed in H/W interrupt context
(while using HR timers), no other timer cancellation is allowed
('qdf_hrtimer_cancel' function will wait for the handler finish)
But if we process the preCAC timer completion work in H/W context,
other timer cancellation will take time. To fix this, process the
preCAC completion work in workqueue context to allow other timer
cancellation.
CRs-Fixed: 3185213
Change-Id: Iaa24055e0d485f613e16d6110d22002fecf10821
dccc154314