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/Kconfig b/arch/sh/Kconfig
index 2af949a..6a1e79b 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -130,6 +130,9 @@
 config ARCH_NO_VIRT_TO_BUS
 	def_bool y
 
+config ARCH_HAS_DEFAULT_IDLE
+	def_bool y
+
 config IO_TRAPPED
 	bool