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: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -130,6 +130,9 @@ config ARCH_HAS_ILOG2_U64
 config ARCH_NO_VIRT_TO_BUS
 	def_bool y
 
+config ARCH_HAS_DEFAULT_IDLE
+	def_bool y
+
 config IO_TRAPPED
 	bool
 

arch/sh/include/asm/system.h

@@ -153,6 +153,7 @@ extern unsigned long cached_to_uncached;
 extern struct dentry *sh_debugfs_root;
 
 void per_cpu_trap_init(void);
+void default_idle(void);
 
 asmlinkage void break_point_trap(void);
 

arch/sh/kernel/idle.c

@@ -38,7 +38,7 @@ static int __init hlt_setup(char *__unused)
 }
 __setup("hlt", hlt_setup);
 
-static void default_idle(void)
+void default_idle(void)
 {
 	if (!hlt_counter) {
 		clear_thread_flag(TIF_POLLING_NRFLAG);