.mailmap: add a couple of aliases for Chandu Babu Namburu

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index 39cbf2a..c6801fe 100644
--- a/.mailmap
+++ b/.mailmap
@@ -114,6 +114,9 @@
 Chad Versace <chadversary@chromium.org> <chad.versace@linux.intel.com>
 Chad Versace <chadversary@chromium.org> <chadversary@google.com>
 
+Chandu Babu Namburu <chandu@amd.com>
+Chandu Babu Namburu <chandu@amd.com> <mailto:chandu@amd.com>
+
 Chia-I Wu <olvaffe@gmail.com> <olv@lunarg.com>
 Chia-I Wu <olvaffe@gmail.com> Chia-Wu <olvaffe@gmail.com>