Dev: Seperate the 8254 timer from tsunami and use it in that and the PC.

src/dev/SConscript

@@ -54,6 +54,7 @@ if env['FULL_SYSTEM']:
     Source('i8254xGBe.cc')
     Source('ide_ctrl.cc')
     Source('ide_disk.cc')
+    Source('intel_8254_timer.cc')
     Source('io_device.cc')
     Source('isa_fake.cc')
     Source('mc146818.cc')
@@ -84,6 +85,7 @@ if env['FULL_SYSTEM']:
     TraceFlag('EthernetSM')
     TraceFlag('IdeCtrl')
     TraceFlag('IdeDisk')
+    TraceFlag('Intel8254Timer')
     TraceFlag('IsaFake')
     TraceFlag('MC146818')
     TraceFlag('PCIDEV')