[PATCH] Various cleanups in the code base found with sparse (v1) for v3.7.

[Konrad Rzeszutek Wilk]

I've been starting to run sparse to make sure we are not introducing
any potential issues. It does not report any in the Xen code-base but it
does reports a bit of the warnings so these take care of removing them.

Most of the warnings were of the type : <function or value> not declared.

And in some cases they just needed to be converted to 'static' or
the header file included in the C code.

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