arch: Change defconfigs to point to g_mass_storage.

The File-backed Storage Gadget (g_file_storage) is being removed, since
it has been replaced by Mass Storage Gadget (g_mass_storage).  This commit
changes defconfigs point to the new gadget.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>  (AT91)
Acked-by: Tony Lindgren <tony@atomide.com>  (OMAP1)
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> (AVR32)
Signed-off-by: Felipe Balbi <balbi@ti.com>

arch/sh/configs/ecovec24_defconfig

@@ -112,7 +112,7 @@ CONFIG_USB_MON=y
 CONFIG_USB_R8A66597_HCD=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_GADGET=y
-CONFIG_USB_FILE_STORAGE=m
+CONFIG_USB_MASS_STORAGE=m
 CONFIG_MMC=y
 CONFIG_MMC_SPI=y
 CONFIG_MMC_SDHI=y

arch/sh/configs/se7724_defconfig

@@ -109,7 +109,7 @@ CONFIG_USB_STORAGE=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_ETH=m
 CONFIG_USB_GADGETFS=m
-CONFIG_USB_FILE_STORAGE=m
+CONFIG_USB_MASS_STORAGE=m
 CONFIG_USB_G_SERIAL=m
 CONFIG_MMC=y
 CONFIG_MMC_SPI=y