Add NanoPi R5S

[HeyMeco]

Hello, could you please add the NanoPi R5S?
All the needed files are in this commit: friendlyarm/uboot-rockchip@8c91d15#diff-9fb7b65b011a9ef16ca84bb286a2386260ac0aca2c7a77602a2fb4d35693974a

[150balbes]

Hi
Sorry, I don't have such equipment, I don't support it.