çå: [PATCH][v2] page_pool: handle page recycle for NUMA_NO_NODE condition

[Li,Rongqing]

> 
> It is good to allocate the rx page close to both cpu and device, but if
> both goal can not be reached, maybe we choose to allocate page that close
> to cpu?
> 
I think it is true

If it is true, , we can remove pool->p.nid, and replace alloc_pages_node with
alloc_pages in __page_pool_alloc_pages_slow, and change pool_page_reusable as
that page_to_nid(page) is checked with numa_mem_id()  

since alloc_pages hint to use the current node page, and __page_pool_alloc_pages_slow 
will be called in NAPI polling often if recycle failed, after some cycle, the page will be from
local memory node.

-Li