Add Lei as Maintainer

Lei has written all the function needed to support updates
on a static layout PNOR. He's committed to maintaining this
piece and verifying that submitted changes are compatible
with this layout.

Change-Id: I50e3c51d47e6e3623849036bb4269d0dee921190
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 056a558..cedb0a3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,5 +44,6 @@
 
 M:  Adriana Kobylak <anoo@us.ibm.com> <anoo!>
 M:  Gunnar Mills <gmills@linux.vnet.ibm.com> <gunnarm!>
+M:  Lei Yu <mine260309@gmail.com> <LeiYU_Mine!>
 R:  Ratan Gupta <ratagupt@linux.vnet.ibm.com> <rgupta!>
 R:  Jayanth Othayoth <ojayanth@in.ibm.com> <jayanth!>