x86, mm: Replace arch_vma_name with vm_ops->name for vsyscalls

This removes the last vestiges of arch_vma_name from x86, replacing it
with vm_ops->name.  Good riddance.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/e681cb56096eee5b8b8767093a4f6fb82839f0a4.1400538962.git.luto@amacapital.net


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>