vfs: permission API cleanup

Highlights are:

 - remove nameidata from the i_op->permission() method
 - remove nameidata passing and consolidate permission()/
   vfs_permission()/file_permission() API

It's all fairly trivial stuff, but I will do some LTP testing on it.

This series is based on the vfs-cleanups(*) tree.  If no problems are
found, I'll commit the patches to that tree.

Thanks,
Miklos

(*) git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git vfs-cleanups

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