MAINTAINERS: erofs: add myself as reviewer

Glad to contribute the fscache mode to erofs. Sincerely I recommend
myself as the reviewer to maintain these codes.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Acked-by: Chao Yu <chao@kernel.org>
Acked-by: Gao Xiang <xiang@kernel.org>
Link: https://lore.kernel.org/r/20220606021103.89211-1-jefflexu@linux.alibaba.com


Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>