The DM entry should be unique, otherwise it will collide with other
drivers. Fix this by assigning the driver a more unique name than
usb_ehci.
Signed-off-by: Marek Vasut <marex@denx.de> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Ian Campbell <ijc@hellion.org.uk> Cc: Simon Glass <sjg@chromium.org>