Kernel: Remove problematic memory mapping methods

mmap() & mmap_region() methods are removed from ACPI & DMI components,
and we replace them with the new MM.allocate_kernel_region() helper.

Instead of doing a raw calculation for each VM address, from now on we
can use helper functions to do perform those calculations in a neat,
reusable and readable way.

Kernel/ACPI/ACPIParser.h

@@ -27,7 +27,4 @@ public:
 protected:
     explicit ACPIParser(bool usable);
     bool m_operable;
-
-    virtual void mmap(VirtualAddress, PhysicalAddress, u32);
-    virtual void mmap_region(Region&, PhysicalAddress);
 };