hw/arm/allwinner-a10: Unconditionally map the USB Host controllers

hw/arm/allwinner-a10: Unconditionally map the USB Host controllers

The USB Controllers are part of the chipset, thus are
always present and mapped in memory.

This is a migration compatibility break for the cubieboard
machine started with the '-usb none' option.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Message-id: 20240119215106.45776-2-philmd@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>