[RFC PATCH v4 25/40] mm: Connect Page Allocator(PA) to Region Allocator(RA); add PA => RA flow

Now that we have built up an infrastructure that forms a "Memory Region Allocator", connect it with the page allocator. To entities requesting memory, the page allocator will function as a front-end, whereas the region allocator will act as a back-end to the page allocator. (Analogy: page

[RFC PATCH v4 25/40] mm: Connect Page Allocator(PA) to Region Allocator(RA); add PA = RA flow

Now that we have built up an infrastructure that forms a Memory Region Allocator, connect it with the page allocator. To entities requesting memory, the page allocator will function as a front-end, whereas the region allocator will act as a back-end to the page allocator. (Analogy: page allocator