mm/page_counter: move calculating protection values to page_counter

It's a lot of math, and there is nothing memcontrol specific about it. 
This makes it easier to use inside of the drm cgroup controller.

[[email protected]: fix kerneldoc, per Jeff Johnson]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Maarten Lankhorst <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Acked-by: Shakeel Butt <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Jeff Johnson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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