MAINTAINERS: Add myself as a reviewer for RISC-V TCG CPUs

Add myself as a reviewer for RISC-V TCG CPU related code to better
participate in patch review.

Signed-off-by: Chao Liu <chao.liu.zevorn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Daniel Henrique Barboza <daniel.barboza@oss.qualcomm.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Message-ID: <20260226102008.146928-1-chao.liu.zevorn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>