This patch is from John Rose <johnrose@austin.ibm.com>.

This patch changes the following iommu-related things:

- Renames the [i,p]series versions of iommu_devnode_init(), to keep
  things logically separate where possible.

- Moves iommu_free_table() to generic iommu.c

- Creates of_cleanup_node(), which will directly precede the dynamic
  removal of any device node
Signed-off-by: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>