[PATCH 02/18] common: Drop flash.h from common header

[Wolfgang Denk]

Dear Simon,

In message <20200406203250.2.Ia0f8528ae0e9e3ead7d99891b46cccaef5859295 at changeid> you wrote:
> Move this uncommon header out of the common header.
>
> Fix up some style problems in flash.h while we are here.

Actually your coding style fixes are anywhere else as well.
I think this should be in a separate commit.

Best regards,

Wolfgang Denk

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