Disable hibernation for powerpc (rhbz 1267395)
    
    A recent binutils update (correctly) started checking for the
    number of arguments to tlbie. This broke some tlb invalidation
    assembly that was invoked during the hibernation path and
    created compilation errorrs. Unfortunately, fixing it is not
    an easy task because nobody is completely sure if it actually
    works. Since this is preventing anything from powerpc from being
    built at all, disable hibernation for now. If/when this gets
    fixed upstream this feature can be turned back on.