dt-bindings: riscv: spacemit: Add Milk-V Jupiter board compatible

dt-bindings: riscv: spacemit: Add Milk-V Jupiter board compatible

Document the compatible string for Milk-V Jupiter board [1], which
is a Mini ITX computer based on the SpacemiT K1/M1 RISC-V SoC [2].

Link: https://milkv.io/jupiter
Link: https://www.spacemit.com/en/key-stone-k1
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Link: https://lore.kernel.org/r/20250214151700.666544-2-javierm@redhat.com
Signed-off-by: Yixun Lan <dlan@gentoo.org>