uboot-imx

odroid-XU3: Add entry for DTS EHCI GPIO

Add samsung,vbus-gpio information for the XU3. This allows the usage of
the EHCI controller on the XU3, which is connected to the SMSC LAN9514
chip (usb hub + network).

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>