get rid of global lock on hpte insert and remove, use a software bit
 for pSeries and the relevant interfaces for pSeries LPAR to avoid
 races.
preload hpte entries in update_mmu_cache.
keep cpu_vm_mask and use tlbiel when mm has only run locally
batch tlb flushes where possible.
add large page support in preparation for generic large page support.
Remove HPTENOIX, we always put slot information into linux ptes now.
Note: pSeries and pSeries LPAR so far, iSeries coming next.