clean up physical merging helpers V2

Christoph Hellwig hch at
Mon Sep 24 00:43:45 PDT 2018

Hi Jens,

this series moves various helpers related to merging based on physical
addresses from the public headers into block/, cleans up the code a bit
and removes not nessecary includes from the block headers.

Change since V1:
 - dropped the Xen related changed which are moved into a new series
   to be sent after this one

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