dt-bindings: riscv: starfive: Add StarFive VisionFive V1 board

Document the compatibles for StarFive VisionFive V1 SBC.
The board is based on the StarFive JH7100 SoC.

Link: https://github.com/starfive-tech/VisionFive


Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>