MAINTAINERS: Update my email and IRC

Updated to correct IRC username and preferred  email address.

Change-Id: I8dda2450bfc53e5a022ffdb35df3fed501dc30c2
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index eed8794..3afd661 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -43,7 +43,7 @@
 -------------------------
 
 M:  Adriana Kobylak <anoo@us.ibm.com> <anoo!>
-M:  Gunnar Mills <gmills@us.ibm.com> <gmills!>
+M:  Gunnar Mills <gmills@linux.vnet.ibm.com> <gunnarm!>
 M:  Lei Yu <mine260309@gmail.com>
 R:  Ratan Gupta <ratagupt@linux.vnet.ibm.com> <rgupta!>
 R:  Jayanth Othayoth <ojayanth@in.ibm.com> <jayanth!>