video: tegra: host: use dynamically allocated wait_queue

video: tegra: host: use dynamically allocated wait_queue

In nvhost_syncpt_wait_timeout(), we currently allocate
wait_queue_head on stack using
DECLARE_WAIT_QUEUE_HEAD_ONSTACK()

If wait is complete, then this wait_queue_head will
removed off the stack

But in some rare case if action_wakeup_interruptible()
is called after wait is complete, we try to access
wait_queue_head which is already deleted from stack

To fix this, define wait_queue_head inside nvhost_waitlist
and allocate it dynamically along with waitlist

Bug 200126989

Change-Id: Iad7869323832e6f36c044e0d29fdea62dca762d5
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/935161
(cherry picked from commit 80b5c960e95b9f1f4c1401b03d72641ac4b6ccc6)
Reviewed-on: http://git-master/r/1013277
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>