MAINTAINERS: self-appoint me as reviewer in build/test automation

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index b2cf062..5d9255e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1858,6 +1858,7 @@
 -------------------------
 M: Alex Bennée <alex.bennee@linaro.org>
 M: Fam Zheng <famz@redhat.com>
+R: Philippe Mathieu-Daudé <f4bug@amsat.org>
 L: qemu-devel@nongnu.org
 S: Maintained
 F: .travis.yml