spapr: Allow some cases where we can't set VSMT mode in the kernel
    
    At present if we require a vsmt mode that's not equal to the kernel's
    default, and the kernel doesn't let us change it (e.g. because it's an old
    kernel without support) then we always fail.
    
    But in fact we can cope with the kernel having a different vsmt as long as
      a) it's >= the actual number of vthreads/vcore (so that guest threads
         that are supposed to be on the same core act like it)
      b) it's a submultiple of the requested vsmt mode (so that guest threads
         spaced by the vsmt value will act like they're on different cores)
    
    Allowing this case gives us a bit more freedom to adjust the vsmt behaviour
    without breaking existing cases.
    
    Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
    Reviewed-by: Laurent Vivier <lvivier@redhat.com>
    Tested-by: Greg Kurz <groug@kaod.org>
    Reviewed-by: Greg Kurz <groug@kaod.org>
    (cherry picked from commit 1f20f2e0ee61d91abff4e86ed1cda1b5244647d3)
    Signed-off-by: Greg Kurz <groug@kaod.org>