sh: allow CONFIG_CPU_IDLE

Allow users to select CONFIG_CPU_IDLE regardless of processor type or board.
Signed-off-by: NMagnus Damm <damm@igel.co.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -764,7 +764,9 @@ endmenu
 menu "Power management options (EXPERIMENTAL)"
 depends on EXPERIMENTAL
 
-source kernel/power/Kconfig
+source "kernel/power/Kconfig"
+
+source "drivers/cpuidle/Kconfig"
 
 endmenu