tici: fix set_realtime_priority (#2124)

* cleanup and pin modeld to core 5

* Unused import
old-commit-hash: 5c058140edb5678cfc31e5103e57cdb5d1c11305

selfdrive/modeld/modeld.cc

@@ -92,6 +92,11 @@ int main(int argc, char **argv) {
   int err;
   set_realtime_priority(51);
 
+#ifdef QCOM2
+  // CPU usage is much lower when pinned to a single big core
+  set_core_affinity(4);
+#endif
+
   signal(SIGINT, (sighandler_t)set_do_exit);
   signal(SIGTERM, (sighandler_t)set_do_exit);