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: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/.mailmap b/.mailmap
index 33001f1..b76f022 100644
--- a/.mailmap
+++ b/.mailmap
@@ -30,6 +30,7 @@
 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>