Edit MAINTAINERS file

Proposing myself as a reviewer.

Change-Id: Ie5303cf029980deeced20764d98b86dd7012aff5
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 4aa823b..fd5fb25 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -67,3 +67,4 @@
 M:  Emily Shaffer <emilyshaffer@google.com> <emilyshaffer!>
 R:  Adriana Kobylak <anoo@us.ibm.com> <anoo!>
 R:  Deepak Kodihalli <dkodihal@linux.vnet.ibm.com> <dkodihal!>
+R:  Ratan Gupta <ratagupt@linux.vnet.ibm.com> <rgupta!>