renderer: Explicit sync fixes (#7151)

Enables explicit sync by default for most platforms

`misc:no_direct_scanout` -> `render:direct_scanout`

src/helpers/sync/SyncTimeline.cpp

@@ -188,3 +188,8 @@ bool CSyncTimeline::transfer(SP<CSyncTimeline> from, uint64_t fromPoint, uint64_
 
     return true;
 }
+
+void CSyncTimeline::signal(uint64_t point) {
+    if (drmSyncobjTimelineSignal(drmFD, &handle, &point, 1))
+        Debug::log(ERR, "CSyncTimeline::signal: drmSyncobjTimelineSignal failed");
+}