autonuma: page_autonuma

Move the AutoNUMA per page information from the "struct page" to a
separate page_autonuma data structure allocated in the memsection
(with sparsemem) or in the pgdat (with flatmem).

This is done to avoid growing the size of the "struct page" and the
page_autonuma data is only allocated if the kernel has been booted on
real NUMA hardware (or if noautonuma is passed as parameter to the
13 files changed