ARM: davinci_all_defconfig: enable support for USB network adaptors

Enables CONFIG_USB_USBNET so that well known USB network adapters
can enumerate as network interfaces.
Signed-off-by: NAparna Balasubramanian <aparnab@ti.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>

arch/arm/configs/davinci_all_defconfig

@@ -94,6 +94,7 @@ CONFIG_PPP=m
 CONFIG_PPP_DEFLATE=m
 CONFIG_PPP_ASYNC=m
 CONFIG_PPP_SYNC_TTY=m
+CONFIG_USB_USBNET=m
 CONFIG_INPUT_EVDEV=m
 CONFIG_INPUT_EVBUG=m
 CONFIG_KEYBOARD_ATKBD=m