sdm: Remove mutex lock when notifying CWB is done

During a continuous CWB use case, deadlock occurs between SDM and
comp manager when CWB sends a notification call back while a commit
is happening on the same display. This change removes the mutex lock
during the CWB notification call back to avoid SDM and comp manager
to indefinitely wait for the same lock.

Change-Id: I28a0bcec2eb6be762537777f798d8ae5647c682a
CRs-Fixed: 3256919

sdm/libs/core/display_base.cpp

@@ -4219,7 +4219,6 @@ DisplayError DisplayBase::ConfigureCwbForIdleFallback(LayerStack *layer_stack) {
 }
 
 void DisplayBase::NotifyCwbDone(int32_t status, const LayerBuffer& buffer) {
-  ClientLock lock(disp_mutex_);
   event_handler_->NotifyCwbDone(status, buffer);
 }