MAINTAINERS: Update my email and IRC

Updated to correct IRC username and preferred  email address.

Change-Id: I470c6ec9f422777552f975b480c2fd910912a32f
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index f66a4ab..056a558 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -43,6 +43,6 @@
 -------------------------
 
 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!>
 R:  Ratan Gupta <ratagupt@linux.vnet.ibm.com> <rgupta!>
 R:  Jayanth Othayoth <ojayanth@in.ibm.com> <jayanth!>