mailmap: add entry for Christian Marangi

Add entry to map ansuelsmth@gmail.com to the unique identity of
Christian Marangi.

Link: https://lkml.kernel.org/r/20220615225012.18782-1-ansuelsmth@gmail.comSigned-off-by: Christian Marangi <ansuelsmth@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

.mailmap

@@ -87,6 +87,7 @@ Christian Borntraeger <borntraeger@linux.ibm.com> <borntrae@de.ibm.com>
 Christian Brauner <brauner@kernel.org> <christian@brauner.io>
 Christian Brauner <brauner@kernel.org> <christian.brauner@canonical.com>
 Christian Brauner <brauner@kernel.org> <christian.brauner@ubuntu.com>
+Christian Marangi <ansuelsmth@gmail.com>
 Christophe Ricard <christophe.ricard@gmail.com>
 Christoph Hellwig <hch@lst.de>
 Colin Ian King <colin.king@intel.com> <colin.king@canonical.com>