sh: Flag __ioremap_caller() __init_refok.

The mem_init_done test makes sure that this path is only entered in
__init cases, so leaving ioremap_fixed() as __init and flagging the
caller __init_refok is sufficient.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/mm/ioremap.c

@@ -33,8 +33,9 @@
  * have to convert them into an offset in a page-aligned mapping, but the
  * caller shouldn't need to know that small detail.
  */
-void __iomem *__ioremap_caller(unsigned long phys_addr, unsigned long size,
-			       unsigned long flags, void *caller)
+void __iomem * __init_refok
+__ioremap_caller(unsigned long phys_addr, unsigned long size,
+		 unsigned long flags, void *caller)
 {
 	struct vm_struct *area;
 	unsigned long offset, last_addr, addr, orig_addr;