feat: GICv2 and timer

fix: TimerReset in GIC.c now uses kTimerFrequency

Kernel/Source/Arch/Timer.c

@@ -0,0 +1,14 @@
+#include <Arch/Timer.h>
+#include <Arch/GIC.h>
+
+void TimerInitialize() {
+    GICEnableInterrupt(kTimerIRQ);
+    TimerReset(kTimerFrequency);
+}
+
+void TimerReset(UInt64 interval) {
+    UInt64 frequency;
+    __asm__ volatile ("mrs %0, cntfrq_el0" : "=r"(frequency));
+    __asm__ volatile ("msr cntp_tval_el0, %0" :: "r"(frequency /interval));
+    __asm__ volatile ("msr cntp_ctl_el0, %0" :: "r" (1));
+}