Revamping directory structure of acpica

[Kamil Rytarowski <n54%gmx.com@localhost>]

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I request to synchronize our in-tree directory structure with upstream
acpica.

At the moment we are moving files and directories around, it makes
harder to upstream our local patches or compare our version with the
upstream one. I know well the reason for our current design, it used
to be unstable in the past, but in recent years it's mostly unaltered.
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