state: simplify direct backend
- drop support for regular files. This, if at all, is only useful for
  debugging. For the debugging case still a file of sufficient size
  can be created manually.
- make stridesize mandatory. Makes the code simpler.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@Sascha Hauer Sascha Hauer authored on 23 Mar 2017
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common/state/backend_storage.c