sh: Wire up ARCH_HAS_DEFAULT_IDLE for cpuidle.

cpuidle wants ARCH_HAS_DEFAULT_IDLE defined in order to use the
default idle loop. So, make it accessible and enable it for all
sh machines.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index fe59ccf..f35ed03 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -38,7 +38,7 @@
 }
 __setup("hlt", hlt_setup);
 
-static void default_idle(void)
+void default_idle(void)
 {
 	if (!hlt_counter) {
 		clear_thread_flag(TIF_POLLING_NRFLAG);