migration: remove myself as maintainer

I'm switching jobs, and I'm not sure I can continue maintaining migration.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1486120416-11566-1-git-send-email-amit.shah@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

MAINTAINERS

@@ -1431,7 +1431,6 @@ F: scripts/checkpatch.pl
 
 Migration
 M: Juan Quintela <quintela@redhat.com>
-M: Amit Shah <amit.shah@redhat.com>
 M: Dr. David Alan Gilbert <dgilbert@redhat.com>
 S: Maintained
 F: include/migration/