MAINTAINERS: add maintainer information for z3fold

Add the maintainer information for the z3fold compressed page allocator. 
Also Add myself as a reviewer.

Link: https://lkml.kernel.org/r/20220530114505.52367-1-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>