Kernel: Move PIC.cpp into Arch/i386/

Kernel/Arch/i386/PIC.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <AK/Types.h>
+
+namespace PIC {
+
+void enable(u8 number);
+void disable(u8 number);
+void eoi(u8 number);
+void initialize();
+u16 get_isr();
+u16 get_irr();
+
+}
+
+class IRQHandlerScope {
+public:
+    explicit IRQHandlerScope(u8 irq)
+        : m_irq(irq)
+    {
+    }
+    ~IRQHandlerScope() { PIC::eoi(m_irq); }
+
+private:
+    u8 m_irq { 0 };
+};