gpu: nvgpu: do not use raw spinlock for ch->timeout.lock

With PREEMPT_RT kernel, regular spinlocks are mapped onto sleeping
spinlocks (rt_mutex locks), and raw spinlocks retain their behaviour.

Schedule while atomic can occur in gk20a_channel_timeout_start,
as it acquires ch->timeout.lock raw spinlock, and then calls
functions that acquire ch->ch_timedout_lock regular spinlock.

Bug 200484795

Change-Id: Iacc63195d8ee6a2d571c998da1b4b5d396f49439
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2004100
(cherry picked from commit aacc33bb47aa8019c1a20b867d3722c241f7f93a
in dev-kernel)
Reviewed-on: https://git-master.nvidia.com/r/2017923
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Tested-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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