armv8: ls2080a: Add USB node in dts for ls2080a

Add the USB node for LS2080a in dts.

Signed-off-by: Sriram Dash <sriram.dash@nxp.com>
[York Sun: replace ls2080 with ls2080a in commit message]
Reviewed-by: York Sun <york.sun@nxp.com>