dt-bindings: soc: sophgo: Move SoCs/boards from riscv into soc, add SG2000

dt-bindings: soc: sophgo: Move SoCs/boards from riscv into soc, add SG2000

Move sophgo.yaml from riscv into soc/sophgo so that it can be shared for
all SoCs containing ARM cores as well. This already applies to SG2002.

Add SG2000 SoC, Milk-V Duo Module 01 and Milk-V Module 01 EVB.

Reviewed-by: Chen Wang <unicorn_wang@outlook.com>
Reviewed-by: Inochi Amaoto <inochiama@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://lore.kernel.org/r/20250612132844.767216-2-alexander.sverdlin@gmail.com
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Chen Wang <wangchen20@iscas.ac.cn>