mailmap: Update mail address for Nicolas Saenz julienne

The @suse.de address doesn't exist anymore. Update it to something not
dependent on my workplace.

Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>

.mailmap

@@ -32,6 +32,7 @@ Jagan Teki <jagannadha.sutradharudu-teki@xilinx.com>
 Igor Opaniuk <igor.opaniuk@gmail.com> <igor.opaniuk@linaro.org>
 Igor Opaniuk <igor.opaniuk@gmail.com> <igor.opaniuk@toradex.com>
 Markus Klotzbuecher <mk@denx.de>
+Nicolas Saenz Julienne <nsaenz@kernel.org> <nsaenzjulienne@suse.de>
 Patrice Chotard <patrice.chotard@foss.st.com> <patrice.chotard@st.com>
 Patrick Delaunay <patrick.delaunay@foss.st.com> <patrick.delaunay@st.com>
 Paul Burton <paul.burton@mips.com> <paul.burton@imgtec.com>