ARM: imx: novena: Enable DM USB

Enable DM USB support on iMX6Q Novena.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Vagrant Cascadian <vagrant@debian.org>

configs/novena_defconfig

@@ -60,6 +60,7 @@ CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y
 CONFIG_DM_SCSI=y
 CONFIG_USB=y
+CONFIG_DM_USB=y
 CONFIG_USB_KEYBOARD=y
 CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP=y
 CONFIG_USB_GADGET=y