MAINTAINERS: add Thomas as additional s390x maintainer

...because two people are better than one.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Message-Id: <20200525155855.225564-1-cohuck@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 3e7d9cb..6e7890c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -85,6 +85,7 @@
 --------------------
 S390 general architecture support
 M: Cornelia Huck <cohuck@redhat.com>
+M: Thomas Huth <thuth@redhat.com>
 S: Supported
 F: default-configs/s390x-softmmu.mak
 F: gdb-xml/s390*.xml