armv8/lsch3/config: Define USB XHCI controller base address for LS2085A

Define base address of both usb xhci controllers in lsch3 config
in the format (IMMR + offset) for LS2085A

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>