MAINTAINERS: update the official rdma git repo
MAINTAINERS: update the official rdma git repo

Linus prefers kernel.org repos to github repos for security.

Signed-off-by: Doug Ledford <f35204f44eabfe97bbcdd18aee9e9fffc59f29e1@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs