ARM: multi_v7_defconfig: Build in DWC2 USB support

This allows the Raspberry Pi 2 to be network booted from the
defconfig.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>

arch/arm/configs/multi_v7_defconfig

@@ -611,7 +611,7 @@ CONFIG_USB_STORAGE=y
 CONFIG_USB_MUSB_HDRC=m
 CONFIG_USB_MUSB_SUNXI=m
 CONFIG_USB_DWC3=y
-CONFIG_USB_DWC2=m
+CONFIG_USB_DWC2=y
 CONFIG_USB_CHIPIDEA=y
 CONFIG_USB_CHIPIDEA_UDC=y
 CONFIG_USB_CHIPIDEA_HOST=y