EFI changes for v3.9-rc3,

  * A new config option and efivars module parameter have been added to
    allow the efivars pstore backend to be disabled as we're still seeing
    issues on machines despite adding heuristics to workaround known bugs.
    Distributions now have a way to disable EFI variable pstore code
    completely - from Seth Forshee.

  * A couple of efivars patches to workaround quirky implementations
    of GetNextVariableName() which resulted in machines hanging and
    sysfs files being created with garbage names.
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