next-cube: remove overlap between next.dma and next.mmio memory regions

next-cube: remove overlap between next.dma and next.mmio memory regions

Change the start of the next.mmio memory region so that it follows on directly
after the next.dma memory region. Increase the address offsets in
next_mmio_read() and next_mmio_write(), and reduce the size of the next.mmio
memory region accordingly.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Message-ID: <20241222130012.1013374-3-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Thomas Huth <huth@tuxfamily.org>