mailmap: Add entry for Leonardo Bras

Add an entry to connect my email addresses.
Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
Link: https://lore.kernel.org/r/20200428024439.215806-1-leobras.c@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

.mailmap

@@ -152,6 +152,7 @@ Krzysztof Kozlowski <krzk@kernel.org> <k.kozlowski.k@gmail.com>
 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 Leon Romanovsky <leon@kernel.org> <leon@leon.nu>
 Leon Romanovsky <leon@kernel.org> <leonro@mellanox.com>
+Leonardo Bras <leobras.c@gmail.com> <leonardo@linux.ibm.com>
 Leonid I Ananiev <leonid.i.ananiev@intel.com>
 Linas Vepstas <linas@austin.ibm.com>
 Linus Lüssing <linus.luessing@c0d3.blue> <linus.luessing@web.de>