[IA64] put kdump_find_rsvd_region in __init

kdump_find_rsvd_region() is only called by
reserve_memory() which is in __init, so it seems that
kdump_find_rsvd_region() should also be in there.
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/efi.c

@@ -1142,7 +1142,7 @@ efi_initialize_iomem_resources(struct resource *code_resource,
 /* find a block of memory aligned to 64M exclude reserved regions
    rsvd_regions are sorted
  */
-unsigned long
+unsigned long __init
 kdump_find_rsvd_region (unsigned long size,
 		struct rsvd_region *r, int n)
 {