Remove duplicated bot linux_msan in cq.cfg.

BUG=None
TBR=fbarchard@chromium.org

Change-Id: Id665a052c0f164ca58ee317ff2cb065c6a67da77
Reviewed-on: https://chromium-review.googlesource.com/521523Reviewed-by: Henrik Kjellander <kjellander@chromium.org>

infra/config/cq.cfg

@@ -45,7 +45,6 @@ verifiers {
         experiment_percentage: 100
       }
       builders { name: "linux_memcheck" }
-      builders { name: "linux_msan" }
       builders { name: "linux_tsan2" }
       builders { name: "linux_asan" }
       builders { name: "linux_msan" }