MLK-22336-4 imx8mm/8mn: configs: Move CONFIG_CI_UDC

MLK-22336-4 imx8mm/8mn: configs: Move CONFIG_CI_UDC

For imx8mm/8mn, the CONFIG_CI_UDC is defined in
include/configs/imx8m*.h, which leads to CONFIG_CI_UDC can not been
enabled in Kconfig, and CONFIG_DM_USB_GADGET which we need selected by
CONFIG_CI_UDC in Kconfig also can not work. So move CONFIG_CI_UDC to
defconfig files.

The CONFIG_USB_GADGET_DUALSPEED is selected by CONFIG_CI_UDC in Kconfig
files too, so we don't need it to be defined in include/configs/imx8m*.h
files.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>