mailmap: add entry for Christian Marangi

Add entry to map [email protected] to the unique identity of
Christian Marangi.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Christian Marangi <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Ansuel

.mailmap

@@ -87,6 +87,7 @@ Christian Borntraeger <[email protected]> <[email protected]>
 Christian Brauner <[email protected]> <[email protected]>
 Christian Brauner <[email protected]> <[email protected]>
 Christian Brauner <[email protected]> <[email protected]>
+Christian Marangi <[email protected]>
 Christophe Ricard <[email protected]>
 Christoph Hellwig <[email protected]>
 Colin Ian King <[email protected]> <[email protected]>