sdm: remove vsync enable as part of commit cycle

DRM driver handles the vsync callbacks in a separate thread now.
Remove vsync enablement as part of commit cycle to avoid janks.

Change-Id: Ib649101845487cb8cecc26184d0edad70e6b1a3d
diff --git a/sdm/libs/core/display_builtin.cpp b/sdm/libs/core/display_builtin.cpp
index 1a853be..af0a67c 100644
--- a/sdm/libs/core/display_builtin.cpp
+++ b/sdm/libs/core/display_builtin.cpp
@@ -673,15 +673,6 @@
     }
   }
 
-  if (vsync_enable_) {
-    DTRACE_BEGIN("RegisterVsync");
-    // wait for previous frame's retire fence to signal.
-    Fence::Wait(retire_fence_);
-
-    // Register for vsync and then commit the frame.
-    hw_events_intf_->SetEventState(HWEvent::VSYNC, true);
-    DTRACE_END();
-  }
   // effectively drmModeAtomicAddProperty for SDE_DSPP_HIST_IRQ_V1
   if (histogramSetup) {
     SetDppsFeatureLocked(&histogramIRQ, sizeof(histogramIRQ));