feat: GICv2 and timer

fix: TimerReset in GIC.c now uses kTimerFrequency

Kernel/Include/Arch/Timer.h

@@ -0,0 +1,8 @@
+#pragma once 
+#include <Types.h>
+
+static const UInt64 kTimerFrequency = 1000; // 1ms
+static const UInt8 kTimerIRQ = 30;
+
+void TimerInitialize();
+void TimerReset(UInt64 interval);