.mailmap: redirect Philipp Tomsich Theobroma address to Vrull

The Theobroma address bounces as Philipp is not working there anymore,
so let's update with the one that seems to be working right now.

Cc: Philipp Tomsich <philipp.tomsich@vrull.eu>
Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>

.mailmap

@@ -88,6 +88,7 @@ This contributor prefers not to receive mails <noreply@example.com> <pali.rohar@
 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>
+Philipp Tomsich <philipp.tomsich@vrull.eu> <philipp.tomsich@theobroma-systems.com>
 Piyush Mehta <piyush.mehta@amd.com> <piyush.mehta@xilinx.com>
 Prabhakar Kushwaha <prabhakar@freescale.com>
 Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@amd.com> <punnaiah.choudary.kalluri@xilinx.com>