Kernel: Removing hardcoded offsets from Memory Manager

Now the kernel page directory and the page tables are located at a
safe address, to prevent from paging data colliding with garbage.

Kernel/VM/MemoryManager.h

@@ -38,7 +38,7 @@ class MemoryManager {
 public:
     static MemoryManager& the();
 
-    static void initialize();
+    static void initialize(u32 physical_address_for_kernel_page_tables);
 
     PageFaultResponse handle_page_fault(const PageFault&);
 
@@ -79,7 +79,7 @@ public:
     }
 
 private:
-    MemoryManager();
+    MemoryManager(u32 physical_address_for_kernel_page_tables);
     ~MemoryManager();
 
     void register_vmo(VMObject&);