mm: use for_each_online_node and node_online instead of open coding

Use more generic functions to deal with issues related to online nodes. 
The changes will make the code simplified.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Peng Liu <[email protected]>
Suggested-by: Davidlohr Bueso <[email protected]>
Suggested-by: Andrew Morton <[email protected]>
Reviewed-by: Muchun Song <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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