ARM64: dts: imx7ulp: update usb compatible

Per binding doc, update the compatible

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20230322052504.2629429-11-peng.fan@oss.nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>