ACPI: restore CONFIG_ACPI_SLEEP

Restore the 2.6.22 CONFIG_ACPI_SLEEP build option, but now shadowing the
new CONFIG_PM_SLEEP option.

Signed-off-by: Len Brown <len.brown@intel.com>
[ Modified to work with the PM config setup changes. ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 66e78d5..934d639 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -42,6 +42,11 @@
 
 if ACPI
 
+config ACPI_SLEEP
+	bool
+	depends on PM_SLEEP
+	default y
+
 config ACPI_PROCFS
 	bool "Deprecated /proc/acpi files"
 	depends on PROC_FS