uboot-imx

MLK-19995 imx8mq: disconnect usb from host for uuu

Stop the usb device controller before enter kernel, this is required
to make kernel can properly init usb controller with it's in stopped
state.

Suggested-by: Ye.Li <ye.li@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>
(cherry picked from commit 27d6b4cf3d8d6701aeb800b307ef52afd18540ba)