[PATCH V2 0/3] powerpc iommu: Remove hardcoded page sizes

[Alistair Popple]

The series doesn't actually change the iommu page size as each platform continues to
initialise the iommu page size to a hardcoded value of 4K.

At this stage testing has only been carried out on a pSeries machine, other platforms
including cell have yet to be tested.

Changes from V1:
* Rebased on Ben's next tree
* Updated constants in 1/3 that were not present in V1 (thanks Alexy!)
* Added initialisation for pasemi platform that was missed in V1