Realtek cr: Add autosuspend function.

The autosuspend function can be disabled by unchecking the Macro
CONFIG_REALTEK_AUTOPM in kernel config file, by default, this macro is
turned on.
Signed-off-by: edwin_rong <edwin_rong@realsil.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/storage/Kconfig

@@ -40,6 +40,10 @@ config USB_STORAGE_REALTEK
 
 	  If this driver is compiled as a module, it will be named ums-realtek.
 
+config REALTEK_AUTOPM
+	bool "Realtek Card Reader autosuspend support"
+	depends on USB_STORAGE_REALTEK && CONFIG_PM_RUNTIME
+	default y
 
 config USB_STORAGE_DATAFAB
 	tristate "Datafab Compact Flash Reader support"