Move KHEAP macros into memlayout.h
Move KHEAP macros into memlayout.h

We should try to make this file architecture agnostic

Herbstein/kernel-of-truth,awensaunders/kernel-of-truth,Herbstein/kernel-of-truth,awensaunders/kernel-of-truth,Herbstein/kernel-of-truth,iankronquist/kernel-of-truth,iankronquist/kernel-of-truth,iankronquist/kernel-of-truth,iankronquist/kernel-of-truth,iankronquist/kernel-of-truth,awensaunders/kernel-of-truth