[MIPS] Make some __setup functions static

This fixes some sparse warnings. ("warning: symbol 'foo' was not
declared. Should it be static?")

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 50ed6d5..ab755ea 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -98,7 +98,7 @@
 
 static int __initdata nowait = 0;
 
-int __init wait_disable(char *s)
+static int __init wait_disable(char *s)
 {
 	nowait = 1;