riscv: dts: sophgo: sg2044: Add missing riscv,cbop-block-size property

The kernel complains no "riscv,cbop-block-size" and disables the Zicbop
extension. Add the missing property to keep it functional.

Fixes: ae5bac3 ("riscv: dts: sophgo: Add initial device tree of Sophgo SRD3-10")
Link: https://lore.kernel.org/r/20250613074513.1683624-1-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>

Author: inochisa