trace: reimplement the DTRACE function so it doesn't use a vector

At the same time, rename the trace flags to debug flags since they
have broader usage than simply tracing.  This means that
--trace-flags is now --debug-flags and --trace-help is now --debug-help

src/dev/ide_ctrl.cc

@@ -34,6 +34,7 @@
 
 #include "base/trace.hh"
 #include "cpu/intr_control.hh"
+#include "debug/IdeCtrl.hh"
 #include "dev/ide_ctrl.hh"
 #include "dev/ide_disk.hh"
 #include "mem/packet.hh"