powerpc-next rebased (again)

[Benjamin Herrenschmidt]

Ok so due to screwup mentioned earlier, it's rebased agian :-(

Hopefully that's the last time for very looooooong...

While at it, I removed the lmb kmemleak patch from Michael since
we decided it wasn't a good idea and added Kumar's fix for
assert_pte_locked().

I also updated the test branch with more stuff such as Fujita
IOMMU bits and pieces.

Cheers,
Ben.