mailmap: add mailmap entries for Jens Axboe

There's an old entry in there already, but update it and add fb/meta
and oracle entries as well.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

.mailmap

@@ -209,7 +209,10 @@ Jeff Garzik <jgarzik@pretzel.yyz.us>
 Jeff Layton <jlayton@kernel.org> <jlayton@poochiereds.net>
 Jeff Layton <jlayton@kernel.org> <jlayton@primarydata.com>
 Jeff Layton <jlayton@kernel.org> <jlayton@redhat.com>
-Jens Axboe <axboe@suse.de>
+Jens Axboe <axboe@kernel.dk> <axboe@suse.de>
+Jens Axboe <axboe@kernel.dk> <jens.axboe@oracle.com>
+Jens Axboe <axboe@kernel.dk> <axboe@fb.com>
+Jens Axboe <axboe@kernel.dk> <axboe@meta.com>
 Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
 Jernej Skrabec <jernej.skrabec@gmail.com> <jernej.skrabec@siol.net>
 Jessica Zhang <quic_jesszhan@quicinc.com> <jesszhan@codeaurora.org>