x86/mm: add huge page support

This is part of a series of commits where i
completely rewrite kmalloc() because it needs to
be able to return physically contiguous memory for
DMA operations.
Yes, i know the build isn't working right now.

include/stdlib.h

@@ -7,7 +7,7 @@
 
 #ifdef _KERNEL
 #include <gay/mm.h>
-#define malloc(size) kmalloc(size, MM_KERNEL)
+#define malloc(size) kmalloc(size, MM_KERN)
 #efine free(ptr) kfree(ptr)
 #else
 /*