armv8: ls1012: added usb nodes in dts

The LS1012A processor has two integrated USB controllers.
One is USB2.0 controller, the other is USB3.0 controller that
allow direct connection to the USB ports with appropriate
protection circuitry and power supplies.

Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>