MAINTAINERS: update Sampa to match Gerrit

The previous email address listed for Sampa is not
found in Gerrit, which breaks the tooling used to
automatically assign reviewers using the MAINTAINERS
file.  Update per Gerrit userid.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia5ee16804050e4037b06b6ff9680cb4b6ea88a28
diff --git a/MAINTAINERS b/MAINTAINERS
index 9dee839..74af8f4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -64,4 +64,4 @@
 
 M:  Deepak Kodihalli <deepak.kodihalli.83@gmail.com> <dkodihal!>
 M:  Tom Joseph <tomjose@linux.vnet.ibm.com> <tomjose!>
-M:  Sampa Misra <sampmisr@gmail.com> <sampmisr!>
+M:  Sampa Misra <sampmisr@in.ibm.com> <sampmisr!>