Blackfin arch: mark init_pda as __init as only __init funcs all it

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/mm/init.c

@@ -104,7 +104,7 @@ void __init paging_init(void)
 	}
 }
 
-asmlinkage void init_pda(void)
+asmlinkage void __init init_pda(void)
 {
 	unsigned int cpu = raw_smp_processor_id();