ACPI: Do not use CONFIG_ACPI_HOTPLUG_MEMORY_MODULE

CONFIG_ACPI_HOTPLUG_MEMORY has been changed to bool (y/n), and
its module option is no longer valid.  So, stop using
CONFIG_ACPI_HOTPLUG_MEMORY_MODULE.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/linux/acpi.h

@@ -352,8 +352,7 @@ extern acpi_status acpi_pci_osc_control_set(acpi_handle handle,
 
 /* Enable _OST when all relevant hotplug operations are enabled */
 #if defined(CONFIG_ACPI_HOTPLUG_CPU) &&			\
-	(defined(CONFIG_ACPI_HOTPLUG_MEMORY) ||		\
-	 defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)) &&	\
+	defined(CONFIG_ACPI_HOTPLUG_MEMORY) &&		\
 	defined(CONFIG_ACPI_CONTAINER)
 #define ACPI_HOTPLUG_OST
 #endif