arm64: dts: imx8mm-nitrogen-r2: add USB support

Add description of USB.
usbotg2 seems to not working on all boards (including ones
from variscite).

Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>