MIPS: Annotate set_except_vector with __init

All call sites of set_except_vector are already annotated with __init, so
annotate that one too.
Signed-off-by: NRegards, Florian Fainelli <florian@openwrt.org>
To: linux-mips@linux-mips.org
To: David Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/888/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/traps.c

@@ -1276,7 +1276,7 @@ unsigned long vi_handlers[64];
  * to interrupt handlers in the address range from
  * KSEG0 <= x < KSEG0 + 256mb on the Nevada.  Oh well ...
  */
-void *set_except_vector(int n, void *addr)
+void __init *set_except_vector(int n, void *addr)
 {
 	unsigned long handler = (unsigned long) addr;
 	unsigned long old_handler = exception_handlers[n];