msm: camera: reqmgr: Pause the timer before sensor stream on

Sometimes, the cpu load is very high, then the devcies
stream on will be delayed, but the CRM watchdog is already
enabled before streaming on, then we will have a chance to
notify SOF freeze issue.
This change pauses the CRM watchdog timer before streaming
on sensor and after stopping ife, when we can detect the
stream on and stream off delay, but don't notify error,
also can detect the real SOF freeze issue.

CRs-Fixed: 2804587
Change-Id: Iccaee837930ea22290b109eff45b05300d844312
Signed-off-by: Depeng Shao <depengs@codeaurora.org>