drm/vmwgfx: Remove drm_crtc_arm_vblank_event from atomic flush

The function drm_crtc_arm_vblank_event should be used for the driver
which have vblank interrupt support. In case of vmwgfx we do not have
vblank interrupt.
Signed-off-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -566,13 +566,9 @@ void vmw_du_crtc_atomic_flush(struct drm_crtc *crtc,
 		crtc->state->event = NULL;
 
 		spin_lock_irq(&crtc->dev->event_lock);
-		if (drm_crtc_vblank_get(crtc) == 0)
-			drm_crtc_arm_vblank_event(crtc, event);
-		else
 		drm_crtc_send_vblank_event(crtc, event);
 		spin_unlock_irq(&crtc->dev->event_lock);
 	}
-
 }