Add USB_EHCI_EXYNOS to multi_v7_defconfig

commit 007487f1 upstream.

Currently we enable Exynos devices in the multi v7 defconfig, however, when
testing on my ODROID-U3, I noticed that USB was not working.  Enabling this
option causes USB to work, which enables networking support as well since the
ODROID-U3 has networking on the USB bus.

[arnd] Support for odroid-u3 was added in 3.10, so it would be nice to
backport this fix at least that far.
Signed-off-by: Steev Klimaszewski <steev@gentoo.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

arch/arm/configs/multi_v7_defconfig

@@ -282,6 +282,7 @@ CONFIG_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_MVEBU=y
 CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_EHCI_EXYNOS=y
 CONFIG_USB_EHCI_TEGRA=y
 CONFIG_USB_EHCI_HCD_PLATFORM=y
 CONFIG_USB_ISP1760_HCD=y