consolidate io_remap_pfn_range definitions

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/m68k/include/asm/pgtable_no.h

@@ -55,9 +55,6 @@ extern unsigned int kobjsize(const void *objp);
  */
 #define pgtable_cache_init()	do { } while (0)
 
-#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
-		remap_pfn_range(vma, vaddr, pfn, size, prot)
-
 /*
  * All 32bit addresses are effectively valid for vmalloc...
  * Sort of meaningless for non-VM targets.