Kernel: Remove kmalloc API for identity mapped results

This is no longer used. This finally allows me to rewrite kmalloc :^)

kernel/include/kernel/Memory/kmalloc.h

@@ -1,15 +1,10 @@
 #pragma once
 
-#include <BAN/Optional.h>
-#include <kernel/Memory/Types.h>
-
 #include <stddef.h>
 
 void kmalloc_initialize();
 void kmalloc_dump_info();
 
 void* kmalloc(size_t size);
-void* kmalloc(size_t size, size_t align, bool force_identity_map = false);
+void* kmalloc(size_t size, size_t align);
 void kfree(void*);
-
-BAN::Optional<Kernel::paddr_t> kmalloc_paddr_of(Kernel::vaddr_t);