riscv: dts: sophgo: add reset generator for Sophgo CV1800 series SoC

riscv: dts: sophgo: add reset generator for Sophgo CV1800 series SoC

Add reset generator node for all CV18XX series SoC.

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Tested-by: Junhui Liu <junhui.liu@pigmoral.tech>
Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://lore.kernel.org/r/20250617070144.1149926-4-inochiama@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>