Update MAINTAINERS list

Add Lei as maintainer.

Change-Id: I8e700aa3de6d6716827b1af4568a9b6c71d2e6a1
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index f66a4ab..eed8794 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,5 +44,6 @@
 
 M:  Adriana Kobylak <anoo@us.ibm.com> <anoo!>
 M:  Gunnar Mills <gmills@us.ibm.com> <gmills!>
+M:  Lei Yu <mine260309@gmail.com>
 R:  Ratan Gupta <ratagupt@linux.vnet.ibm.com> <rgupta!>
 R:  Jayanth Othayoth <ojayanth@in.ibm.com> <jayanth!>