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Continuation of crrev.com/c/2463047

This requires moving other structures and functions from
partition_alloc.* into their own, new files.

Change-Id: I8ceb9966787ef0b4240790f8a77fa46d35efa455
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498022
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821351}