[ion] Add RTC subsystem

apps/clock_timer.cpp

@@ -0,0 +1,12 @@
+#include "clock_timer.h"
+#include "apps_container.h"
+
+ClockTimer::ClockTimer(AppsContainer * container) :
+  Timer(1),
+  m_container(container)
+{
+}
+
+bool ClockTimer::fire() {
+  return m_container->updateClock();
+}