[SPARC]: Respect vm_page_prot in io_remap_page_range().

Make sure the callers do a pgprot_noncached() on
vma->vm_page_prot.

Pointed out by Hugh Dickens.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/mm/generic.c

@@ -140,7 +140,6 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
 	vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
 	vma->vm_pgoff = phys_base >> PAGE_SHIFT;
 
-	prot = __pgprot(pg_iobits);
 	offset -= from;
 	dir = pgd_offset(mm, from);
 	flush_cache_range(vma, beg, end);