[PATCH] USB Gadget: Use configuration-buffer library in file-storage

This patch imports the config-buffer library into the file-storage gadget,
simplifying and decreasing the amount of code needed for assembling
configuration descriptors.  It also changes the driver to remove any
pretense at bus-powered operation and to use the new DUALSPEED
configuration option.  This is in line with recent changes made to other
gadget drivers.

drivers/usb/gadget/Makefile

@@ -13,7 +13,7 @@ g_zero-objs			:= zero.o usbstring.o config.o epautoconf.o
 g_ether-objs			:= ether.o usbstring.o config.o epautoconf.o
 g_serial-objs			:= serial.o usbstring.o
 gadgetfs-objs			:= inode.o
-g_file_storage-objs		:= file_storage.o usbstring.o
+g_file_storage-objs		:= file_storage.o usbstring.o config.o
 
 ifeq ($(CONFIG_USB_ETH_RNDIS),y)
 	g_ether-objs		+= rndis.o