mailmap: add entries for Richard Leitner

Map all my old email addresses to my current address.

Link: https://lkml.kernel.org/r/20230316-my-mailmap-v1-1-76bc3a36ba41@linux.dev
Signed-off-by: Richard Leitner <richard.leitner@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: g0hl1n

.mailmap

@@ -390,6 +390,9 @@ Rémi Denis-Courmont <rdenis@simphalempin.com>
 Ricardo Ribalda <ribalda@kernel.org> <ricardo@ribalda.com>
 Ricardo Ribalda <ribalda@kernel.org> Ricardo Ribalda Delgado <ribalda@kernel.org>
 Ricardo Ribalda <ribalda@kernel.org> <ricardo.ribalda@gmail.com>
+Richard Leitner <richard.leitner@linux.dev> <dev@g0hl1n.net>
+Richard Leitner <richard.leitner@linux.dev> <me@g0hl1n.net>
+Richard Leitner <richard.leitner@linux.dev> <richard.leitner@skidata.com>
 Robert Foss <rfoss@kernel.org> <robert.foss@linaro.org>
 Roman Gushchin <roman.gushchin@linux.dev> <guro@fb.com>
 Roman Gushchin <roman.gushchin@linux.dev> <guroan@gmail.com>