Remove CPU pinning flags that measured slower than the scheduler

rx.go

@@ -21,7 +21,6 @@ type rxStats struct {
 type rxWorker struct {
 	fd      int
 	batch   int
-	cpu     int
 	spec    *frameSpec
 	stats   *rxStats
 	streams []lossWindow
@@ -30,8 +29,6 @@ type rxWorker struct {
 }
 
 func (w *rxWorker) run(done *atomic.Bool) {
-	pinTo(w.cpu)
-
 	bufs := make([][]byte, w.batch)
 	for i := range bufs {
 		bufs[i] = make([]byte, maxFrame)