Revert "Revert "ACPI: dock driver""

This reverts 953969ddf5b049361ed1e8471cc43dc4134d2a6f commit.
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 290c767..fef7bab 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -133,6 +133,13 @@
 	  This driver adds support for ACPI fan devices, allowing user-mode 
 	  applications to perform basic fan control (on, off, status).
 
+config ACPI_DOCK
+	tristate "Dock"
+	depends on !ACPI_IBM_DOCK
+	default y
+	help
+	  This driver adds support for ACPI controlled docking stations
+
 config ACPI_PROCESSOR
 	tristate "Processor"
 	default y