MAINTAINERS: Remove myself as reviewer from Live Migration

I am currently focusing in kernel development, so I will probably not be
of much help in reviewing general Live Migration changes.

For above reason I am removing my Reviewer status from Migration and RDMA
Migration.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Link: https://lore.kernel.org/r/20231221170739.332378-1-leobras@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
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