arm64: dts: imx8qxp: add cadence usb3 support

There are cadence usb3.0 controller in 8qxp and 8qm.
Add usb3 node at common connect subsystem.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>