USB: Use menuconfig objects

commit 04d06ad0f1fdb499af84ae3d7969e2136a462f38 have added menuconfig support
for the whole USB Kconfig, but there are still menuconfig need for usb/serial,
usb/atm, and usb/gadget, so that the user can disable all the options in that
menu at once instead of having to disable each option separately.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 8a88f24..c139551 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -12,10 +12,9 @@
 # With help from a special transceiver and a "Mini-AB" jack, systems with
 # both kinds of controller can also support "USB On-the-Go" (CONFIG_USB_OTG).
 #
-menu "USB Gadget Support"
 
-config USB_GADGET
-	tristate "Support for USB Gadgets"
+menuconfig USB_GADGET
+	tristate "USB Gadget Support"
 	help
 	   USB is a master/slave protocol, organized with one master
 	   host (such as a PC) controlling up to 127 peripheral devices.
@@ -42,6 +41,8 @@
 	   For more information, see <http://www.linux-usb.org/gadget> and
 	   the kernel DocBook documentation for this API.
 
+if USB_GADGET
+
 config USB_GADGET_DEBUG
 	boolean "Debugging messages"
 	depends on USB_GADGET && DEBUG_KERNEL && EXPERIMENTAL
@@ -570,4 +571,4 @@
 
 endchoice
 
-endmenu
+endif # USB_GADGET