MAINTAINERS: erofs: add myself as reviewer

MAINTAINERS: erofs: add myself as reviewer

In the past two years, I have focused on EROFS and contributed features
including the reserved buffer pool, configurable global buffer pool, and
the ongoing direct I/O support for compressed data.

I would like to continue contributing to EROFS and help with code
reviews. Please CC me on EROFS-related changes.

Signed-off-by: Chunhai Guo <guochunhai@vivo.com>
Acked-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Acked-by: Chao Yu <chao@kernel.org>
Acked-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>