ACPI: ibm-acpi: make ibm-acpi bay support optional

Make ibm-acpi bay support optional at kernel compile time.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index e942ffe..ee3dcd1 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -242,6 +242,17 @@
 
 	  If you are not sure, say N here.
 
+config ACPI_IBM_BAY
+	bool "Legacy Removable Bay Support"
+	depends on ACPI_IBM
+	default y
+	---help---
+	  Allows the ibm_acpi driver to handle removable bays.  It will allow
+	  disabling the device in the bay, and also generate notifications when
+	  the bay lever is ejected or inserted.
+
+	  If you are not sure, say Y here.
+
 config ACPI_TOSHIBA
 	tristate "Toshiba Laptop Extras"
 	depends on X86