Follow Linux pagetable accessor name convention.
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>

A bit more strict comparison.
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>

This is just a cleanup, but adds a few macros here, which can be used
in the proceeding patches.
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

This patch provides:

- iotlb_*()     : iommu tlb operations
- iopgtable_*() : iommu pagetable(twl) operations
- iommu_*()     : the other generic operations

and the entry points to register and acquire iommu object.
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>