mailmap: Update mail address for Igor Opaniuk

My address at Toradex doesn't exist anymore, map this address
to my personal email.
Signed-off-by: NIgor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

.mailmap

@@ -30,6 +30,7 @@ Jagan Teki <jaganna@xilinx.com>
 Jagan Teki <jagannadh.teki@gmail.com>
 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>
 Patrice Chotard <patrice.chotard@foss.st.com> <patrice.chotard@st.com>
 Patrick Delaunay <patrick.delaunay@foss.st.com> <patrick.delaunay@st.com>