Update mailmap to indicate ani@anisinha.ca and anisinha@redhat.com are one and
the same person. Additionally update MAINTAINERS and bits documentation to use
my work (redhat) email.

Signed-off-by: Ani Sinha <anisinha@redhat.com>
Message-Id: <20230320114233.90638-1-anisinha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>