.mailmap: add an alias for Qiang Yu

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index 2501494..5482179 100644
--- a/.mailmap
+++ b/.mailmap
@@ -487,6 +487,8 @@
 
 Plamena Manolova <plamena.manolova@intel.com> <plamena.n.manolova@gmail.com>
 
+Qiang Yu <yuq825@gmail.com> <Qiang.Yu@amd.com>
+
 Quentin Glidic <sardemff7+git@sardemff7.net> <sardemff7@sardemff7.net>
 
 RALOVICH, Kristóf <tade60@freemail.hu> <kristof.ralovich@gmail.com>