testing/device-solidrun-cubox: new aport

New port of the CuBox with the Marvell Armada 510 ArmV7 SoC with a 6.11.5 mainline kernel.

Status:

• boot from sd (no internal storage)
• Ethernet
• UART
• LED
• GPU (etnaviv)
• USB host
• IR remote receiver
• HDMI out
• SPDIF audio out
• ESATA (no cable & device for testing yet)